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Do you require a Damp Proof Course (DPC) for external wall Silicone Render?
Anonymous user 23/02/2024 - 3.40 PM
Do you require a Damp Proof Course (DPC) for external wall Silicone Render? The DPC was plastered over with Cement and absorbing moisture. Some have advised removing this and others say it's not necessary before silicone render. What is best please?
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4 Answers
Lee Minter
Rating: 5 out of 5
There needs to be a break in render above and below dpc. Back to back stop beads of different depths is ideal
Answered7 May 2021
9
Bos Plastering
Rating: 5 out of 5
The dpc is to stop ground water rising through your walls, rendering over it creates a bridge that water will use to cross the dpc. Water will still cross this cement bridge behind a silicon render top coat
Answered31 May 2021
0
John Gibb Plastering Ltd
No reviews yet
You've got to take the render off below the dpc as this will cause rising damp regardless of what you put on top.
So either chop it off and put a drip bead on the dpc level leaving the brickwork below clear, or if the brickwork below dpc is unsightly then cut out a few inches above and below dpc, install movement bead, rerender and then apply silicon coat
Answered3 June 2021
0