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Frequently Asked Questions

Need a little help? Below is a list of the most popular questions that we have been asked. If there are any questions not answered below please do not hesitate to contact us.

Techno EPDM Questions

What is Tecno EPDM?

EPDM means ethylene propylene diene monomer. It is a synthetic rubber, with outstanding weatherproof properties, developed over 50 years ago.

I have never installed a rubber flat roof… is it easy?

Our Techno EPDM kits are specifically designed for the competent DIYer.  Some roofs are very easy to weatherproof, particularly freestanding roofs etc. Some roofs require more expertise e.g. roofs with multiple skylights or awkward pipes and apertures.

Do I need specialist equipment to install my new rubber roof?

You should only need basic hand tools for a straightforward roof. e.g. tape measure, shovel, broom, hammer, handsaw, rubbish bags etc.

How long does it take to install?

The average (20m2) rear extension should only take a morning to install. Getting the roof stripped off and any decking replaced if needed usually takes longer than installing the Techno EPDM.

I am worried about stripping off my old roof and leaving it exposed to the elements!

We strongly advise our clients to check both the weather forecast and that they have the correct materials on site prior to starting. The beauty of the Techno system is that if you do get caught in an unexpected shower you have a pre-cut weatherproof sheet to hand... which you can use as a tarpaulin!

Do I need to strip off my old roof?

It depends if the timber substrate is sound. If there has been a long-term leak, or the decking is chipboard, then the roof may need re-boarding in places. If the substrate is sound and the felt cleaned of dust etc then the EPDM can probably be adhered directly to it using contact adhesive (although this is trickier to install).

To save the time and expense, some customers simply overboard their roofs with new ply or OSB, screwing into the existing substrate.

Is there an up or down when installing the rubber?

Techno EPDM is identical on both sides.

Are the products safe to use?

Yes, all products are supplied with clear instructions. Sensible precautions should be taken i.e. do not inhale adhesive fumes, do not allow children access to the products etc.

How long will my roof last?

Your new Techno EPDM membrane is guaranteed not to fail due to weathering for 20 years. It is essential that the product is installed in accordance with our detailed instructions.

Is Techno EPDM environmentally friendly?

Yes, EPDM is an inert material with limited environmental impact during manufacture and installation process.

Can I use Techno EPDM in really hot or really cold weather?

For the best results use in mild conditions, the adhesives should not be used if temperatures are likely to be below 5 degrees Celsius within 24 hours.

Can I use Techno EPDM on top of insulation boards to create a warm roof?

We recommend a ply faced insulation board e.g. Kingspan TR31 or similar. Alternatively, you can insulate on top of the decking with foil faced boards, then overboard with OSB or plywood, secured with long screws.

Can I adhere Techno directly to felt, fibreglass, asphalt or concrete?

Our contact adhesive can be used for this type of application but, unlike our water-based glue, this is quite tricky to do on large areas. We strongly recommend over boarding roofs with a minimum 12mm ply or OSB and using the water-based glue.

Can I walk on my new Techno EPDM roof?

The membrane is incredibly tough and perfect for maintenance access. For balconies etc then we would recommend additional protection. E.g. paving slabs, walkway pads or timber decking.

My EPDM appears to be quite chalky, is that OK?

Chalk is used in the manufacturing process to prevent the membrane sticking together. It will gradually weather off and does not affect its lifespan.

I have some wrinkles in my rubber roof, is this a problem?

There may be wrinkles or creases in the membrane. These may be caused in manufacturing or shipping. Open out and allow the membrane to "relax" for as long as possible prior to adhering. For stubborn creases, a gentle heat source (e.g. a heat gun or hairdryer) should be applied prior to adhering.

There are joins in the rubber, why is this?

Firestone RubberCover EPDM is manufactured in Saudi Arabia and the large panels are created using vulcanised seams.  The material of these seams is homogenous and 100% cured.

Can I install EPDM in the rain?

The water-based adhesive will work on damp timber but is not designed to be used in the rain. Contact adhesives will only work on dry substrates

Can I install a cement screed on top of EPDM to create a walkway or balcony?

Techno EPDM is perfectly compatible with sand and cement.

What is the biggest size of Techno that you stock?

Our largest 045 (1.2mm) roll is an incredible 12.2m x 30.5m (40ft x 100ft). Our largest 060 (1.52mm) roll is an incredible 12.2m x 30.5m.

My EPDM roof has been damaged, can it be repaired?

EPDM roofs can be easily repaired using the Techno 9" Flashing Tape and primer, cut the Flashing Tape to the desired shape and size, prime the area, allow to go touch dry. Peel the backing paper off and mate the surfaces together. Roller using a silicone roller.

Service Questions

How long will my delivery take?

The delivery is generally next day, however on occasions some of the items are delayed. Please allow adequate time for things to arrive prior to installing the roof.

How do I return something?

Please call us and notify us why it is being returned, Package the goods and return to Rubber Roofs, Unit 7 Blenheim Road, Cressex Industrial Estate, High Wycombe, Bucks, HP12 3RS. Please note there will be 10% restocking charge on all items.

My rubber is the wrong size, what do I do?

Please call the office within 72 hours of delivery, we will arrange for a replacement piece to be sent and the incorrect one collected.

My items have been damaged by the carrier?

Please call the office within 72 hours of delivery, we will then arrange for replacement items to be sent.

How do I get my 20-year warranty?

Please register your details with the website, log in using your credentials, click account on the top navigation bar, then select orders. Click the order you wish to generate a warranty for, scroll to the bottom and download the warranty

Can I get trade discounts?

We offer trade discounts based on spend, if you would like more information please call 01494 461711.

How do I place an order?

Orders are generally placed online via the online cart, roof calculator. Orders can be placed over the phone, but we prefer customers to use our online portal.

My order is incorrect, what do I do?

Please notify the office with 72 hours of delivery, we can then investigate and send any missing items.

How do I get technical assistance?

We have over 35 years fitting experience and are happy to assist with any technical queries you may have. Please call 01494 461711 for further help.

Do you offer any form of promotional literature?

We offer a wide range of promotional literature, please e-mail or call 01494 461711.

Lineflex Questions

How long will Lineflex Fleece Backed EPDM last?

Lineflex Fleece Backed membrane has a life expectancy of 50 years.

Does the membrane come with warranty?

Yes, you will receive a 20-year warranty on Lineflex Fleece Backed membranes.

Can it be walked on?

For maintenance access only.

How long does it take to weld and does it need time to cure?

Weld at a rate of 2.5 metres per minute and it sets pretty much instantly.

What fire regulations does Lineflex have?

EN 13501

Does the fleece back still need insulation?

Yes. The fleece has minimal impact on U value.

Is training required?

We offer a range of installer training, please see our training section.

RubberRoofs friendly helper, Roofus

Looking for help or advice?

Installing your own flat roof couldn't be easier - we have a range of tools to help with your flat roof installation, and we offer detailed PDFs, online videos, and our fantastic online calculator. If you still can't find what you need, please email us at or call 01494 461711.

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