Home arrow Friday, 30 January 2015
Main Menu
Free Roof Survey & Quote
Contact Us
Roof Insulation
Spray Foam Roof Tales
Insulation Grants
Building Regulations
Metal Roof
Loft Insulation
Attic Insulation
Customer References
RIS News
Partner Web Sites
Frequently Asked Questions
Site Map
The Mad Surveyor
Surveyors' login
Multi-foil insulation?
Roof Window Special Offer
Job Opportunities
Zero Carbon
Customer Resources
Duratherm BBA Certificate
Spray Foam & Condensation
Transform your loft
Spray Foam Production
Privacy Policy
Bookmark Us
Login Form

Lost Password? Click here to retrieve.
Need to register first? Click here to Register
Spray Foam Promotion Freephone 0800 019 6064

Roofing and Insulation Services - RIS - Spray Foam Roof Insulation

is used to solve condensation (click here), roof and insulation (click here) problems and will cure slipping tiles and slate when spray bonded from inside the loft. RIS-Spray polyurethane foam is a high performance low cost solution that is quickly installed with minimum disruption. The manufacture and application of RIS-Spray Foam is done under rigorous ISO 9001 quality control.

RIS-Spray 14001 accreditation logoWe value ISO14001 certification; we care about what we do and the environment. We only use British made foams where the lineage and quality can be relied upon to produce a first class product on site that does not compromise fire safety. All our installed foams reach British Class 1 fire rating in line with Fire and Building Regulations. Please note that DIY foams do not meet this standard and we no longer supply DIY spray foam kits for this very reason.

Spraying DIY foams should never be used as an exposed lining as it contravenes Building and Fire Regulations. Spray foam installed foam has the lowest lambda value or thermal conductivity making it the very best insulation you can install and has the added benefit that it is also air-tight. Spray foam is the only insulation product that stops the three primary and three secondary methods of heat loss and thus provides the very best insulation method in the UK.

RIS-Spray website Isothane Duratherm BBA logoThat is why we use Isothane Duratherm which is British Board of Agrement (BAA) approved. Because of our purchasing power we can pass huge savings onto customers and we are, when comparing like for like, the lowest cost spray foam contractor in the UK with our unique competitive price guarantee. Buy in confidence, the lowest prices, the highest quality with ISO 9001 and ISO 14001 and product accreditation.

For a low cost and quick (a day or two) - transformation of your loft and roof please see transform your loft, click here.

Free Roof Insulation Survey - All UK - click here

Enquire about Spray Foam Insulation - click here

Control Condensation - click here

Please see our Friday, 30 January 2015 Quality Branded Roof Window and Polyurethane Spray Foam special offer click here

Foam Roofing and Insulation Contract Services (brand or trade names: IsoTech, IsoTherm) are a UK based polyurethane spray foam contractor. We are also a national sprayfoam roofing contractor, our company works all over the UK and we do industrial and domestic insulation contracts. We offer free friendly advice, a prompt and courteous service, a high quality product and the lowest competitive prices.

Spray foam insulation is eco friendly, does not deplete the ozone layer, gives no toxic off gases and offers excellent thermal insulation. It is a polyurethane spray foam insulation product that is used as a low cost alternative to re-roofing buildings and also provides excellent thermal and anti-condensation for warm roof, attic, loft and metal roof insulation.

We make the polyurethane foam on site and pump the foam using high pressure heated hoses from the truck to the install point. After any roof repairs required, the polyurethane foam is heat applied at high pressure and sprayed onto tiles or slates or other substrates. This seals the roof and prevents the ingress of wind blown rain, snow, dust and debris, and acts to bond and stabilise an old roof. The depth of sprayfoam installed provides the thermal insulation or U value required. Most domestic installations are completed within one to two days.

Rigid polyurethane spray foam is effective in controlling condensation on metal roofing by creating a warm roof resulting in excellent thermal and sound insulation. Because the  foam insulation can be applied direct to the substrate surface, it is excellent for metal cladding insulation and asbestos cladding insulation on industrial buildings and farm buildings.

Rrigid foam can also be used to provide roof insulation, wall insulation and floor insulation in new and existing buildings as it is a relatively easy retro installation fit. Spray foam saves you money on heating costs and produces an economical long lasting solution to your roofing problems creating a polyurethane foam spray seal that provides a warm roof and a warm attic space and eliminates condensation on tiles, slates, metal roofing and metal cladding. Since Iso Foam is a spray applied it will fit any shape and area and fits when insulation boards are difficult to fit or pose an interstitial condensation risk due to inability of the boards to eliminate air movement via joins.

Want the best deal this January on roof repairs and polyurethane spray foam? click here

>> Friday, 30 January 2015 Special Offer - We Pay Your VAT on SprayFoam this month!
* Get your special offer coupon code to qualify for a VAT FREE domestic installation - click here.
* We settle your VAT on foam insulation residential installations!
* Roof insulation spray foam materials discounted.

>> Friday, 30 January 2015 Special Offer and limited to 24 hours per enquirer.
Whilst stocks last, this month we will install a genuine branded roof window - Free!
* Get Your Coupon Code for this Offer
click here!
* This month we will supply and install a branded roof window - totally FREE of charge with every domestic property foam install
* All home owner occupier residential installations qualify whilst stocks last subject to 48 hour acceptance per customer!
* All work to current Building Regulations and includes window flashings and rafter timber trimming supports

>> Request a Free Roof Survey
* Free, no obligation roof survey.
* Your roof repair and spray foam insulation options discussed.
* Roof insulation surveyor - no salesmen will call - full written quotation provided before you order.
* No deposits - pay only after all work is completed to your satisfaction.

* Highly competitive rates, lowest prices guaranteed.
* 25 year written guarantee provided with every foam installation

>> Roof Problems? Roof repairs needed? We do the lot!
* Is your roof leaking?
* Cold, dusty and draughty loft and attic space?
* Slipped, cracked, broken or missing tiles or slates?
* Lead flashings and lead soakers passed sell by date?
* Ridge and hip tiles loose and need re-pointing?
* Roof under felt perished or non existent?
* Laths or wooden battens beginning to rot?
* Cold and damp attic or loft, poor insulation?
* No roof insulation or loft insulation and Freezing in Winter?
* Frozen water pipes and tanks?
* Gale/wind damaged roof?
* Roof hip irons badly corroded or missing?

>> RIS-Spray Spray Foam Roof Solutions with 25 Year Foam Guarantee!
* Spray foam rigid insulation - the most efficient and cost effective insulator there is.
* Spray foam bonding slate and tile.
* Roof repair and renovation.
* Slipping slates and tiles spray foam bonded.
* Prevents condensation and prevents the ingress of wind blown rain, snow and debris
* Replaces under-felt, stops cold drafts.
* Roof can be fully repaired and renovated.
* Excellent thermal insulation.
* A warm roof, a warm loft, a warm attic, a warm home!

>> RIS-Spray Quality
* Polyurethane spray foam products are proven for over 30 years
* Rigid foam material made to Iso quality standards.
* British Standard Class 1 fire rating - does not spread fire and resistant to ignition.
* Workforce has over 20 years experience.
* Free and friendly advice covering all aspects of current Building Regulations
* All work by fully trained and employed operatives.
* Fully insured for all work carried out.
* All customers left fully satisfied with all work done.
* 25 year guarantee provided on sprayfoam installations.

>> RIS-Spray Foam Insulation Saves You Money
* Significantly cheaper and better than a re-roof.
* A warm, clean, insulated and usable loft space.
* Low cost loft room addition, we fit roof windows too!
* Save up to 30% on heating bills, stop heat escaping from the roof.
* Adds significantly to the investment value of your home.
* Low cost and affordable roof repairs.
* All-in-one solution, roof repaired and excellent roof insulation.
* Highly competitive and low prices, competitive price guarantee.

>> Interesting Facts
* Spray foam appeared on TV program Tomorrow's World in 1977.
* A green product, saves on green house gases.
* Cheaper than a re-roof, spray seals all nooks and crannies.
* Better than a re-roof, longer lasting than a re-roof

>> Save on Heating Costs
* A warmer and comfortable home, save on heating costs.
* Seals out wind blown rain, snow, wind, cold.
* Keeps your home warm and dry.
* Eliminates the risk of loft pipes and tanks from freezing.
* Metal roofing heat loss and condensation problems solved.

>> Proven Technology

* A well tested and tried insulation technology
* Isothane Duratherm Foam has been tested by the British Board of Agrement (BBA)
* Surpasses Building Regulations requirements when the foam is applied to an average depth of 40mm. This reduces the 'U' Value of a roof with 100mm of fibre-glass at ceiling level from 0.35W/m2K to 0.22 W/m2K, surpassing Building Regulations.
* British Standard Class 1 Surface Spread of Flame when tested to BS 476 Part 7.

>> Meets Building Regulations for Warm Deck
* Exceeds 'U' value requirement of 0.25 W/m2K or less with an application of 100 mm depth of foam.
* Meets Building Regulations Part L1 for domestic buildings.
* Meets cold bridging requirement due to spray seal between laths.
* Meets Part F of Building Regulations for condensation control.
* System as installed is defined as a "warm deck" or "warm roof".
* 'U' value 0.25 W/m2K or less achieved at 100 mm foam depth specification.

By installing rigid roof insulation at rafter level it keeps the loft void warmer and prevents condensation build up which otherwise occurs when increasing loft insulation at ceiling level. Also, rafter cold bridging can be minimised by spraying the rigid foam behind the rafter and in between the roof laths. The warmer, drier, cleaner roof space helps minimise the risk of pipes and tanks from freezing in winter months.

Polyurethane spray sealing roof solutions:
RIS-Spray polyurethane foam contract solutions add to the investment value of your home. As national UK roofing contractors, we will tackle all roof repairs and then bond the repairs by spray sealing with hot pressure applied polyurethane foam. The benefits are a stable roof that prevents the ingress of wind blown rain, snow and debris, a warm roof in winter, a cool home in summer with money savings on energy costs and a significant saving over a re-roof.

RIS-Spray offer low cost repair solutions for long lasting warm roofs using polyurethane foam to stabilise, repair, bond and spray seal loose tiles and slates. Your roofing problems are cured using low cost RIS-Spray with a 25 year polyurethane foam guarantee.

RIS-Spray, for Roof and Insulation Foam Contracts, is an established and respected polyurethane spray foam insulation contractor and a national roofing contractor. The foam spray has excellent insulation qualities. Spray foam is now extensively used as a loft insulation material throughout the UK and helps eliminate roof condensation and meets warm deck (warmdeck) Building Regulations requirements for a warm roof. RIS-Spray repair the roof and do a complete renovation before spraying the with polyurethane spray foam. Industrial, commercial and domestic systems have been developed to provide solutions to all roof problems including tile, slate, metal, asbestos, timber decking. and metal roofing where condensation and thermal heat loss is a concern. The rigid foam can also be used as acoustic spray foam roof seal to generally quieten the home.

RIS-Spray - call  for free advice and your next step for a cost effective, fully renovated and repaired roof, bonded and insulated with rigid polyurethane spray foam. Polyurethane spray seal and bonding helps stabilise the roof structure helping make your home, quieter, warmer in winter and cool in summer.

Free Roof Insulation Survey

Building Regulations 2006 maximum U value to be attained.







Flat roof or roof with integral insulation


Pitched roof (insulation at ceiling level)


Pitched roof (insulation at between rafters)


Windows, roof windows and roof lights


Doors with more than 50% of the internal surface area glazed


Other doors


Please go to our Customer Resources area to review all our technical documents and company brochures.

Some Pictures!


 A very happy customer under the scaffolding after RIS-Spray renewed his roof

New tiled roof, renewed in 'Ludlow Plus', final checking and nearing completion

Canal longboat after prepartion and about to receive the RIS-Spray foam insulation treatment

The inside of the canal longboat after being sprayed by RIS-Spray

The tile on the right came off the northern elevation of the roof; just see how badly 'frost bitten' the tile is with significant undershaling

The undershaled tile on the right has almost completely perished and about to disintergrate - new roof beckons

A first class job; spray foam insulation applied to a pitched rafter roof

An asbestos 'big 6' roof being prepared to receive the RIS-Spray treatment

An abestos big 6 sprayed with polyurethane spray foam, prevents condensation, bonds the roof and provides energy saving thermal insulation

'Potholer' Harry, one of our spray foam sprayers in a cramped and tight loft space, no standing room

Foam sprayer spraying a traditional pitched 'rosemary' tiled roof

Northern facing elevation of an inter war semi-detached house where significant tile undershaling was present; a new roof was called for

New tiled roof on a traditional semi detached house

View from the roof and not seen from the ground showing rosemary tiles needing replacement

The road to achieving 0 Carbon emissions will mean the most efficient insulation being installed, RIS-Spray


Exterior of a 'big 6' corrugated asbestos roof needing renovation

Polyurethane chemical bonds molecule

Relative insulation values by depth of different insulators, polyurethane foam being the best and least depth sacrifice


Loft transformed by application of RIS-Spray foam, warm, friendly, usable and a fraction of the cost of a formal loft conversion

See the difference RIS-Spray makes; the bungalow on left with zero roof heat loss after being sprayed with RIS-Spray foam

An RIS-Spray foam sprayer in action

Roof windows fitted by RIS-Spray, often part of free offers when we get good deals on stock

Spray Foam Production

The production of British Class1, high density polyurethane foam requires very sophisticated and costly technology to ensure the customer receives a top quality product and the best polyurethane insulation chemicals.

Isothane have invested millions in research and development to ensure the very best spray foam on the market and are one of the top 40 UK exporting companies with the highest year on year growth.

 Isothane main offices and factory unit

Main production offices.

Isosthane polyurethane production plant

Chemical synthesis plant.

Temperature control storage vessels

Outside temperature controlled storage.

Polyurethane chemical drum filling station

Drum pouring department.

Isothane chemical feeding tanks

Chemical feeding tanks.

Isothane chemical sample filling

Sample pouring.

Isothane chemical reaction vessels

Reaction vessels.

Drum storage prior to despatch to main warehouse

Drum despatch prior to storing in main warehouse.

British Standard Class 1 and German B2 Fire Ratings Fire safety is a crucial part of building design. Customers may have come across German fire rated products such as spray foam kits that generally meet the standard known as B2 fire rating. This article deals with fire ratings and standards under the Building Regulations and why in general it may not be wise to apply just a B2 rated product on areas greater than 4m2.

The latest Building Regulations for England and Wales contain fire safety standards. Approved document B2 deals with fire safety standards and the compliance standards permitted.

The Building Regulations, part B2 of approved document B (page 59 in latest document), define a lining as being any building product that lines any partition, wall or ceiling or internal structure (e.g. roof). Clearly spraying high density polyurethane foam is going to form a lining under the Building Regulation definitions.

Approved document B2 goes on to specify the fire ratings building linings must achieve. Linings that are greater than 4m2 in area must achieve British Standard Class 1 fire rating (or equivalent) in domestic properties and must be Class O (or equivalent) where a property has shared or communal areas, for example, common reception and stairwell areas in an apartment building.

RIS-Spray use a Class 1 fire rated product so will meet most general building lining applications. Where Class O is required (e.g. car park concrete soffit) a Class O coating is applied to ensure it meets Building Regulations.

In April 2008 the Corporate Manslaughter and Corporate Homicide Act came into force so it is wise to ensure that all applications meet Building Regulations as there are now severe penalties in law for non compliance with fire safety standards including imprisonment and very large lines. It is no longer enough to hide behind a corporate identify as individuals will be held to account and be liable.

Customers should be aware that, in general, imported foam and spray foam DIY Kits do not have a British Standard Class 1 fire safety designation but may meet a German fire standard known as a B2 fire rating. The Building Regulations say that direct equivalence of fire standards must be demonstrated if not tested under British Standards. Unfortunately, British Standard Class 1 is not directly equivalent to B2 as the testing methodology is different. However, European Class C-s3, d2 is deemed under the Building Regulations as being equivalent to Class 1.

When in doubt we advise customers to only use spray foam that meets British Standard Class 1 fire rating; the penalties for getting it wrong under the Corporate Manslaughter and Corporate Homicide Act are just too great.

You can download approved document B2 here. It may take a while to download as the document is almost 5 MB is size.

Polyurethane Chemistry

For those from a technical and chemistry background you might find the following article an interesting insight to the chemistry of polyurethanes. It is intended to give a brief technical introduction to the chemistry of polyurethanes and to satisfy the frequent student requests we get to provide some details on the chemistry of polyurethane foam.

Polyurethane plastics are produced by the condensation reaction of a polyol and a ‘di-isocyanate.’ Note the 'iso' within diisocyanate which is often used as a root word in the naming of polyurethane technology companies. These chemicals are often referred to as 'A' and 'B' when industrially mixed. The chemical reaction has the following formula:

 Polyurethane chemical formula

When polyol and diisocyanate are reacted the reaction is quick and can be violent if not controlled by specific quantities. The commercial production of spray foam polyurethane typically involves reacting the reactants, polyol and diisocyanate, in 50:50 proportions and mixing small amounts under pressure at the focus of a spray gun to give the resultant polyurethane foam. Heat and pressure are also used to and it is typical to produce industrial spray foams at 120 degrees temperature under 600 psi pressure to optimise the volume of foam produced and provide a quick cure time within minutes.

No by-product is formed from the reaction of a polyol and a diisocyanate. Toluene diisocyanate is a widely used monomer. Diols and triols produced from the reaction of glycerol and ethylene oxide or propylene oxide and are considered very suitable for producing polyurethanes. Depending on the mix and type of the polyol, polyurethane polymers are either rigid or flexible. For example, triols derived from glycerol and propylene oxide are used for producing block slab foams. These polyols have moderate reactivity because the hydroxy groups are predominantly secondary. More reactive polyols (used to produce injected moulding polyurethane foams) are formed by the reaction of polyglycols with ethylene oxide to give the more reactive primary group:

polyol chemical formula
Other polyhydric compounds with higher functionality than glycerol (three-OH) are commonly used. Examples are sorbitol (six-OH) and sucrose (eight-OH). Triethanolamine, with three OH groups, is also used. Diisocyanates generally employed with polyols to produce polyurethanes are 2,4-and 2,6-toluene diisocyanates prepared from dinitrotoluenes.

toluene diisocyanate chemical formula

Synthetic Petroleum-Based Polymers
A different diisocyanate used in polyurethane synthesis is methylene diisocyanate (MDI), which is prepared from aniline and formaldehyde. The diamine product is reacted with phosgene to get MDI. The physical properties of polyurethanes vary with the ratio of the polyol to the diisocyanate. For example, tensile strength can be adjusted within a range of 1,200–600 psi; elongation, between 150–800%.

Improved polyurethane can be produced by copolymerization. Block copolymers of polyurethanes connected with segments of isobutylenes exhibit high-temperature properties, hydrolytic stability, and barrier characteristics. The hard segments of polyurethane block polymers consist of (–RNHCOO)–n, where R usually contains an aromatic moiety.

Properties and Uses of Polyurethanes

The major use of polyurethanes is to produce foam although non foam type polyurethane plastics are also made. The density as well as the mechanical strength of the rigid and the flexible type foams can vary widely depending on the polyol type and reaction conditions. The polyol is where the chemistry research money is spent as all the 'magic' of the subsequently produced foam is largely in the polyol. For example, polyurethanes could have densities ranging between 10 - 100 Kg/M3 for the flexible types and 50 - 1000 Kg/M3 for the rigid and more high density foams. Densities can be achieved such that large trucks can be driven over the foam without causing any damage. Polyurethane foams typically have good abrasion resistance, very low thermal conductance (hence their wide use as thermal insulators) and good load bearing characteristics. However, they have moderate resistance to organic solvents and are attacked by strong acids. Uncured foam can be ‘dissolved’ by using acetone which is quite effective at removing uncured foam but cannot remove foam that has already cured. Foam can also be cut and shaped by carpenter tools, saws and chisels as it behaves like very soft timber. Foams can be flammable unless specific flame retardants are added into the mix on the polyol side. Flame retardency of polyurethanes could be improved by using special additives such has boron compounds, spraying a coating material such as magnesium oxychloride on top of the foam, or by grafting a halogen phosphorous moiety to the polyol. Trichlorobutylene oxide is sometimes copolymerized with ethylene and propylene oxides to produce the polyol.

Major markets for polyurethanes are furniture, packaging, transportation, and building and construction. Other uses include carpet underlay, textural laminates and coatings, footwear, packaging, toys, and fibres. The largest use for rigid polyurethane is in construction and industrial insulation due to its high insulating property. The foam can be installed in sheets or sprayed in place where it will provide the best available thermal insulation per depth of material at an acceptable price versus performance. No other commercially available product has a better price performance point and polyurethane foams are increasingly being specified to meet the needs of more exacting building regulations for thermal insulation.

The diagram below compares the degree of insulation of some common insulating materials used in construction. These figures are calculated under the assumption of 'still' air but under real world conditions polyurethane sprayed in place foam is more than 5 times more effective per depth over products such as glass or mineral wool insulation. This is because no air currents can pass through the polyurethane due to the tight cell structure of the foam and it acts as an air barrier preventing air from either side from mixing.

Comparison of building materials and relative insulation values under 'still' air conditions:

relative insulation values of other insulators compared to polyurethane spray foam

Under real world conditions with thermal air currents, ventilation and wind air movements the difference between rigid, high density polyurethane foam  and mineral wool or glass fibre insulation is 5 to 6:1 depth factor in favaour of polyurethane foam since polyurethane is an air barrier as well as an insulator and needs less depth to achieve a specified U value. This fact is not bourne out by laboratory calulations for lamda and 'U' values which adopt still air conditions for testing and this unduly favours mineral wool and glass fibre insulation when considering price versus performance.

Moulded urethanes are used in the automotive industry for items such as bumpers, steering wheels, instrument panels, and body panels. Elastomers from polyurethanes are characterized by toughness and resistance to oils, oxidation, and abrasion. They are produced using short-chain polyols such as polytetramethylene glycol from 1, 4-butanediol. Polyurethanes are also used to produce fibres. For example, ‘Spandex’ (trade name) is a copolymer of polyurethane (85%) and polyesters.

Polyurethane foam typically has a low melting point and so cannot be used as a fire barrier. However, polyurethane networks based on triisocyante and diisocyanate connected by segments consisting of polyisobutylene are fairly rubbery and exhibit high temperature properties, hydrolyic stability, and barrier characteristics. This makes these types of polyurethanes suitable as water proof coatings.

Recommend RIS
Google Site Search