Hi so im new to this forum but have been a lurker for a while, just made an account for some advice
recently bought an early 1905 semi, double brick cavity walls with foam cavity wall insulation injected in there
the house had lots of issues including timber rot & damp. a few walls suffering from what looks a mixture of rising damp, penetrating damp & also hygroscopic salts around chimney breasts, all damp areas of the house are now back to brick.
Ive replaced all rotted timbers, treated remaining timbers, cleared out all air bricks, added extra air bricks & cleaned out the subfloor which im hoping will solve any future rot issues
Now the damp, ive cleaned out cavitys where possible, and also looking into replacing the exterior cracked render which i think could be a big cause of issues, but im aware that even once fixing damp cause, walls will hold moisture for a long time, so i need to decide how to tackle the plastering
My plan was: all damp areas that are back to brick, render with s&c with a waterproofer & salt inhibitor
Then dot and dab the lot
i then found out about cold spots etc and the danger of getting wet marks all over my new boarding,
so i then considered changing out the standard plasterboard for a foil backed board, until i read that they cannot be fixed using Dot & Dab,
which has now led me to maybe using insulated polystyrene backed blasterboard, which im hoping would act as a waterproof barrier as well as improve insulation???
What are people thoughts on this? Would this method hold back any residual damp and avoid getting damp dab marks all over the finish?
The boards i had in mind - 22mm
http://www.buildingmaterials.co.uk/gyproc-thermaline-basic-insulated-plasterboard.html
Thanks for reading
recently bought an early 1905 semi, double brick cavity walls with foam cavity wall insulation injected in there
the house had lots of issues including timber rot & damp. a few walls suffering from what looks a mixture of rising damp, penetrating damp & also hygroscopic salts around chimney breasts, all damp areas of the house are now back to brick.
Ive replaced all rotted timbers, treated remaining timbers, cleared out all air bricks, added extra air bricks & cleaned out the subfloor which im hoping will solve any future rot issues
Now the damp, ive cleaned out cavitys where possible, and also looking into replacing the exterior cracked render which i think could be a big cause of issues, but im aware that even once fixing damp cause, walls will hold moisture for a long time, so i need to decide how to tackle the plastering
My plan was: all damp areas that are back to brick, render with s&c with a waterproofer & salt inhibitor
Then dot and dab the lot
i then found out about cold spots etc and the danger of getting wet marks all over my new boarding,
so i then considered changing out the standard plasterboard for a foil backed board, until i read that they cannot be fixed using Dot & Dab,
which has now led me to maybe using insulated polystyrene backed blasterboard, which im hoping would act as a waterproof barrier as well as improve insulation???
What are people thoughts on this? Would this method hold back any residual damp and avoid getting damp dab marks all over the finish?
The boards i had in mind - 22mm
http://www.buildingmaterials.co.uk/gyproc-thermaline-basic-insulated-plasterboard.html
Thanks for reading