Render repair.

[whiskywill]

I have a zigzag crack in my house rendering which I believe is a settlement crack. What is the best way to repair it?

I thought to open it out, paint with Unibond and use a mortar mix to patch it. Is there a better way?

 

[whiskywill]

So I got it right, then. :?:

 

[Phil Pascoe]

Yes. If you use a disc cutter to clean the crack out, you can dovetail it so the repair has a much better chance of staying put. Wash the dust out before the PVA. I use a garden mister so as not to get it too wet. I've read that PVA makes no difference, but I did some coping stone years ago with my bil (that's what he maintained) and after a few years every one he did came off and every one I did is still there.

 

[Phil Pascoe]

If you wish to blend it in with the existing masonry it might be better to use kiln dried sand - it's finer. (probably pushes in easier as well)

 

[whiskywill]

Thanks. That's my day off next week sorted.

 

[flat n smooth]

Dont bother with pva for render unless its the waterproof type...use sbr which is made for usees like this, make sure all the loose is well raked out before

 

[blackrodd]

Dont bother with pva for render unless its the waterproof type...use sbr which is made for usees like this, make sure all the loose is well raked out before

I guess F&S means Make sure that you use the exterior grade unibond, which I believe comes in the RED containers and kiln dried sand is always better for this use, normally used in kiddies sand playbox.
There's a man who did some of these here and was really good at it, couldn't see a mark when finished, and painted until you were about 3 feet away, and then just the odd mark. Regards Rodders

 

[RogerS]

I would also recommend adding some fibre reinforcement to minimise further cracking...which almost certainly will happen again DAMHIKT

http://www.ebay.co.uk/itm/ADFIL-Fibrin- ... 51bf95f6e2