builderbloke

In the process of having a new flat roof laid. The first cement screed/base (using fine sand) was down and then 4 coats of the waterproofing product applied all over it. Then some small ventilation holes drilled to the outside walls to put small pipes (about the size of 5p coin) in for air-circulation about 10 around two sides of the roof. All completely dry and no leaks. Good so far.

However, 5 Hours after having the second cement screed/base on top (this time using coarser sand). It started to rain.

Will this cause a problem. Will all the new cement have to come up because there is nowhere for the water to go except into it. Will it penetrate through the roofmate & just sit there and never dry out. Which will cause a problem later on when the tiles are laid as they will start to lift after time.

PS The roof of the house is in Spain, so it maybe slightly different than normal. Any advice please

If you go to site called Permavent low pitch roofing systems and I am pretty sure it will help you. They do supply to France so spain should not be a problem

Try the new Permavent low pitch roofing web site. It seems to be very popular and the web site is very helpful.

Im thinking of buying a house which has a low pitched felt roof. I would prefer to have something longer lasting but wouldnt be able to do slate etc as the house is not able to take the weight. Ive read about mastic asphalt which sounds good, but i'd love some more advice if anybody can help?

Try the new permavent easy slate, easy tile, low pitch roofing system web site. Its new and it seems to be the way to go at the moment

Hi

Have you tried the new permavent roofing system I have heard it is new and works well. It deals with low pitch roofing eco felt membranes and there is a new web site which is very useful. Let me know if this helps.