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Gryfiss

I'd stick a single ply fleece backed membrane over the top. And make sure you get a guarantee from the contractor. Should be able to get at least 10 year workmanship and product guarantee if they are any good!

Gryfiss

I would take a close look at the guarantees on offer from both Sarnafil and which ever GRP company you are looking at. You'll be surprised by what they actually cover and what you can claim for if something goes wrong! It may give you an idea which product you can have confidence in and ultimately g...

Gryfiss

Certainly would. The only difference would be in the type of finish to the insulation board. Different waterproofing membranes are compatible with different finishes on the topside of the insulation. Again, speak to the insualtion manufacturer who will guide you as to which type you need.

Gryfiss

You need a Polyisosanurate Insulation Board (PIR for short) which are available from Kingspan or Celotex. Thickness of the board will depend on the U Value you are looking to achieve but I would suggest that 100mm should suffice in order to achieve 0.25 U Value. Ask the chosen supplier to carry out ...

Gryfiss

Hot works on site you say, seems like a health and safety mine field to me!!

Gryfiss

This type of roof construction is known as a cold roof. The void between the insulation board and your roof deck MUST be ventilated. Install either trickle vents (leading to the outside) or some form of mechanical ventilation in the roof. This should sort your problem.

Gryfiss

If you have an issue with the weight that your roof deck would be able to support all you need to do is build a small timber kerb (50mm wide by 150mm high) around the aperture you want for your rooflight. You then dress your roofing membrane up and on to the top of the kerb and then you can screw fi...

Gryfiss

Would try Sarnafil. Give there local technical adviser a call and he would be happy to give you technical help with the roof construction and provide you with a full roof specification. Look on the internet for there website.

Gryfiss

Would recommend Sarnafil single ply roofing system. BBA certificate shows life in excess of 30 years which is backed up by an unmatched product guarantee. They can do site visit and draw up recommendations and obtain quotes from there list of registered roofing contractors. They have a good website ...

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