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Installing bifolds before floor completed?

I am having a single storey kitchen/diner extension with bifold doors. My builder has started installing the bifold doors before the concrete floor/screed is completed. He has told me the doors need to be installed so the concrete can then be poured up to the door frames. Is this the normal process? I am concerned about the risk of damage to very expensive doors from the subsequent work. Also I know concrete is alkaline - can it affect the paint on the doors?

3 Answers from MyBuilder Extension Builders

Can be done either way, should not be a problem.


Answered 28th Apr 2015

Yes this can be done however you need to be aware that if the bifold needs to be removed for any reason this will most likely cause damage to both door and floor, I'm my experience a good builder should get his floor level sorted then
Install the bifolds.

Iv worked in the bifold industry for over 12 years and worked with the country's biggest manufacturers and bifold installation companies. Plus Iv worked many times with DIY SOS and cowboy builders so my advise would be to make sure the person who installed the bifolds are from a good bifold installation company and not a builder. So many times Iv had to rip out jobs because builders don't understand the product.

Please feel free to look me up on my Twitter and Facebook accounts and see how they should be installed


Hope this helps

The Bifold Fitter & Service Engineer


Answered 3rd Mar 2016

Very common, nothing to worry about! On 90% of the bifolds i fit, the floor is poured or screeded after. Just make sure the threshold on your bifold is correct to your finish floor level!


Answered 25th Sep 2018

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