Breathable membrane to keep loft space clean

Martyn_H

Buttwhy? wrote: »

In a hoprizontal fitting position the overlap would be 100mm. The sheets usually have a dotted line at the overlap point which makes it very easy to get right.

Thanks very much!

Martyn_H

Is it necessary to tape the overlaps or staple onto battens to stop the dirt blowing in?

FilthyLuka

these breathable felts are designed to go above the rafters - not underneath

if you have traditional ventilated soffits then fitting this stuff would stop the flow of air keeping condensation from building up on the rafters (but not half as bad as fitting plasterboard or polythene to the underside)

Martyn_H

Short of having the roof retiled I can't fit the membrane as intended.

Martyn_H

andrew-b wrote: »

back to post #5 then. Dust sheets and plastic boxes with lids are cheaper anyway Or get a big shed in the garden (i went this route!).
Basically you dont wan't any unheated spaces that are also unventilated else you will likely get condensation issues at least in the extremes of winter.

And the dirt might hold damp against the rafters.