Hi all you plasterers.
Blocked up a cavity back door opening last September, it was into an internal porch but is now totally inside. I used Thermalite blocks both sides, tied into the existing brickwork both sides & between the cavity. I then plastered using Hardwall with a multi-finish skim. The blockwork was pre-treated with one sealing coat of PVA & then a wash coat immediately prior to applying the Hardwall. The original finish was a sand/cement render with finish skim over old fashioned Breeze blocks.
I am now slightly peeved to see hairline cracks appearing along the outline of the blockwork, what (if anything) did I do wrong? Through necessity I have taught myself to put the stuff on, learned how it behaves & can now achieve a very good finish, even on ceilings. All of the repair work & plasterboard skim work I have done in the rest of the house is OK, it’s only the stuff on the new blockwork openings that seems to be playing up. I have a large new wall to plaster & I don’t want the same thing happening again!
Blocked up a cavity back door opening last September, it was into an internal porch but is now totally inside. I used Thermalite blocks both sides, tied into the existing brickwork both sides & between the cavity. I then plastered using Hardwall with a multi-finish skim. The blockwork was pre-treated with one sealing coat of PVA & then a wash coat immediately prior to applying the Hardwall. The original finish was a sand/cement render with finish skim over old fashioned Breeze blocks.
I am now slightly peeved to see hairline cracks appearing along the outline of the blockwork, what (if anything) did I do wrong? Through necessity I have taught myself to put the stuff on, learned how it behaves & can now achieve a very good finish, even on ceilings. All of the repair work & plasterboard skim work I have done in the rest of the house is OK, it’s only the stuff on the new blockwork openings that seems to be playing up. I have a large new wall to plaster & I don’t want the same thing happening again!