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Parapet Wall - Render or Re-point? Mortar Mix?
Anonymous user 23/02/2024 - 2.53 PM
Hi. I'd love some guidance / opinion on if the proposed works to the parapet wall on my Victorian terrace house are suitable. The proposal is to render the entire wall which is currently still brick exposed but pointed, using a 3 to 1 mix of sand and cement mortar. Is this OK? I've read bad things about cement based mortar on walls, or even as re-pointing? I'd be very grateful for any opinions? thanks.
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4 Answers
R.Hughes Building and Conservation Ltd
Rating: 5 out of 5
Avoid anyone recommending the use of cement at all, especially a 1:3 mix!!! This is no good for either repointing or rendering a Victorian house!!
Your Victorian house just needs repointing using a lime mortar, either an NHL3.5 or an NHL5. An experienced brick mason qualified in using traditional materials with traditional techniques would do this no problem.
Have a read online about the problems caused by cement in traditionally built houses.............
Answered24 November 2014
4
Anonymous user
I would just re-point the whole wall with a 3 sand and 1 cement mix and have it done by a bricklayer and myself would not bother with a render
Answered21 November 2014
2
A&J Surveyors Ltd
Rating: 5 out of 5
I would consider 1:3 is a very strong mix and will possibly crack and fail.
One consideration before rendering is to ensure the bricks are dry, otherwise again it will fail.
I have recently seen render board used over old surfaces, then the this rendered instead, with good results.
Ensure your coping stones have either a DPC beneath them or sealed, I find fibreglassing these is a very good alternative.
Regards
Andrew @ Fibretechs - Glos
Answered21 November 2014
1
Tez Handyman Services
Rating: 5 out of 5
I would need more info to answer this fully. As there can be various reason why a pharapet wall is failing
1.are the bricks it solid condition IE not Spalding or blown!
if blown. Faces crumbing etc then a renderr may be your best option
If the bricks are in good d condition and the mortar joints are soft then they can be raked out to a depth of 30mm and repointed a4to one mix of Portland cement is fine as long as the wall is wetted downfirst preventing rapid drying and shrinkage.
How ever you neglect to say wether you have any water penetration in the room below the in which case you would need to check the d.p.c which could have perished
Also as the the coping in good condition with a proper drip on the underside which prevents water dripping directly onto the wall.
Hope this helps Tez
Answered5 November 2019
0