Fitting external concrete mouldings around bay windows

7 Sep 2010
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United Kingdom

As the original external mouldings above our bay window had slumped and were starting to look pretty dodgy - we removed these and had new concrete cast mouldings made to replace these. The builders have already put the scratch coat and rendered ontop in the area where the mouldings are to go. As it seems pretty straightforward enough we've decided to save our pennies and fit the mouldings ourselves. There are a couple of holes in each section of moulding for screws but for additional fitting think it'll be best to use some type of concrete/mortar compound to make sure the mouldings stay in place.

Bearing in mind these are external walls, and a render has already been placed ontop of the scratch coat - what mortar mix would be best to use? Would it be something with an adhesive mixed in to make sure the mouldings don't shift or fall?

Or would a really stong glue plus metal rods be good? Really confused. Have googled and googled and not found anything on the topic.

Any help/suggestions much appreciated.

Thanks in advance

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Good quality rapidset tile cement would probably make a good job of it.

Although precast concrete gives almost no suction so one which is suitable for use on porcelan/ natural stone would be best.

That's genius - I hadn't thought of that. Sounds like an excellent solution. One other thing - We have precast holes in the mouldings - what do you think would work best (along with the rapidset tile cement) - stainless steel screws or metal rods?

Thanks again :D
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stainless rods would be good but they are a bit hard to get and very expensive for your needs. A few big stainless screws would be just the ticket.


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