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mending rendering-cement or silicon?

geordief · 2010-11-19 13:43:29

I am poking around with the front of the house and have uncovered old repairs done to cracks in the rendering. It is over 20 years old at least and I think at was a professional job. They obviously widened the cracks , filled them with a sealant (silicon mastic by the feel of it) and recovered with a thin local layer of…

19-11-2010 02:43PM

#1

geordief

Registered Users, Registered Users 2 Posts: 475 ✭✭

Join Date: November 2004

Posts: 287

I am poking around with the front of the house and have uncovered old repairs done to cracks in the rendering.
It is over 20 years old at least and I think at was a professional job.
They obviously widened the cracks , filled them with a sealant (silicon mastic by the feel of it) and recovered with a thin local layer of cement which was then painted.
I am wondering if I should redo this the same way -or would cement be adequate
Have silicon sealants improved greatly over the past 20 years -enough to justify using them instead as I guess they would be a bit more flexible than cement?
The cracks are up to 5 feet in length (vertical and horizontal) and would be at most half an inch wide at the openings.

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