Extension maintenance

[gas01]

My house has a timber frame extension with tiles on the outside and i have a small damp problem inside near one of the corners.

After taking off a few tiles near the ground level, I noticed that there is like a black material under the tiles, probably what keeps the water and rain off my plasterboard I suppose.

Well I need to know what that black material is please as its ripped and rotted away at the bottom, so I thought I would buy some and patch it up.

So....does anyone know what its called and can i pick it up at a place like b&q

Thanks

 

[^woody^]

If it is not polythene, then its more likely to be a breathable membrane - waterproof but lets the timber breath and stay dry. This will look a bit like thin cloth

The membrane can be expensive for a whole roll, so for a small area you could patch it with normal felt, thick polyphene or wide DPC. Or if you see some builders using it for roofing - normally a white/grey colour then ask for a bit for the price of a pint or two.

Either way its important to do a proper repair and stop the damp

 

[JohnD]

I have a slate-hung blockwork wall (with shiplap at the ground floor) with what looks like roofing felt behind the battens.

See also //www.diynot.com/forums/viewtopic.php?p=452027&highlight=#452027

 

[gas01]

Would I be OK in getting one of those vapour permeable membranes from jewsons as it looks like that would do, although it would seem it was meant for roofs.

Thanks

 

[^woody^]

Generally roofing membrane is made to a higher specification, so should be OK on vertical panels. But if is exposed to sunlight, then it must be a UV resistant type

 

[gas01]

thanks for ur advice woody, i'll be looking n jewsons or b&q for some of that stuff soon.