Ask a tradesperson
Damp Proofing
Rendering over dpc.
Hi there,
I have a house that was built around 1890 and is of brick construction with a rendered band running around the base which also forms square edged columns around the front door. Until recently the house had a concrete front garden that met the building at the level of the base of the grille ventilating the ground floor cavity.
I have removed the concrete slab as it was falling toward the building and was, I thought, too high in relation to the ventilation grille. Removing the concrete slab exposed the DPC visible at the level of the base of the grille. To be 'belt and braces' I removed the render one course above the dpc and injected Dryzone into the mortar joint.
My questions are
- if i lower the new front garden level to 150mm below DPC im going to be very nearly on top of the brick tier foundation, is this a problem
- I want to reinstate the render band as all the other houses have them and it also forms part of the elevation detailing around the front door, but have read that the render shouldnt go past the DPC. If i stopped the render above the DPC and dropped the ground 150 i'd be left with a band of fairly tatty looking bricks that have been underground for the last 40 years. How could I finish this without compromising the damp proofing?
- should I install a french drain of some kind?
Many thanks for your help!
2 Answers from MyBuilder Damp Proofing Specialists
Best Answer
London•Member since 26 May 2011•298jobs,99%positivefeedback
Hi there
You could fix a bell cast bead just on the dpc then render above and below this is to stop you bridging the damp course keeping both renders separate,use water proof render on both levels sika water- proofer.
regards
Joseph
tridentdamp
Answered 8th May 2013
Kingston•Member since 12 Dec 2014•6jobs,83%positivefeedback
Hi, you should use Stainless Steel Render Stop Beads to construct a horizontal expansion joint at the DPC, and either leave it clean (ensure no bridging) or Mastic Fill in a colour to suit your finish.
As Trident suggest use Sika1 as additive to the render(both coats)
Answered 20th Jan 2015
Related Questions
- 1) Should a builder check a lead drain channel which subsquently damaged his new rendering ? 2) Should the builder have anticipated a saltpeter problem, caused new rendering to fall off ?
I had water leaking into my ground floor walls (inside and outside) through a balcony located above it. The builder put a water...
- Rendering over exisiting painted render
Confused.com We've just finished major renovation and house needs rendering due to new steels, windows/doors etc. House already...
- Rendering over existing new rendering
Hi all, I recently got a local plasterer to render a retaining block wall I had built. He did an absolutely shocking job of it....
- air brick rendering over
we had damp walls due to the cavity wall insulation being wet seeped through brickwork a builders answer, was to install large air...
Post your job to find high quality tradespeople and get free quotes
Question Categories
- All Questions
- Architectural Services
- Bathroom Fitting
- Bricklaying
- Carpentry & Joinery
- Carpet & Lino
- Central Heating
- Chimneys & Fireplaces
- Conservatories
- 转换- - - - - -General
- Damp Proofing
- Demolition & Waste Clearance
- Driveways
- Electrical
- Extensions
- 筋膜,索夫its & Guttering
- Fencing
- Gas Work
- Groundwork & Foundations
- Handyman
- Hard Flooring
- Insulation
- Kitchen Fitting
- Landscape Gardening
- Locksmiths
- Loft Conversions
- New Builds
- Painting & Decorating
- 抹
- Plumbing
- Restoration & Refurbishment
- Roofing
- Security Systems
- Stonemasonry
- Tiling
- Tree Surgery
- Windows