Hello There

I am new to this forum and this is my first post so I hope I have posted this in the correct place.

I have recently put down laminate flooring in what is going to be our kitchen. The room was originally 2 rooms that have been knocked into one. What used to be a small galley kitchen is on a recently re-laid concrete base. The rest of the floor is sat on new flooring grade chipboard.

I have used role out underlay (not the really cheap/free stuff) and now the floor is down there seem to be areas that dip when walked on.

I would be interested to know if people think it is worth pulling up the flooring to put down the thick laminate underlay boards to fix this problem. Do they make a big difference? Also does anyone have any ideas of how this could be fixed without pulling up the floor?

Thanks in advance for any advice.

Best Regards

James

The wood'll need to come up sorry

have you got 12mm expansion in all areas around the floor including door frames central heating pipes ect
what is the maximum continuouse run without an expansion gap

is the expansion gap full clear eg no cork or no nails filling it in

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Thanks very much for the quick replies.

I have left expansion gaps in all areas. I haven't started to put edging round the room as yet so don’t think that is the issue.

The dips all seem to be around the newly put down concrete but some are just to the side of it. The room is quite large (around 15’ X 10’) and the floor has been laid length ways. I don’t think any of the dips go down more than 1.5cm. Do you think this is something that would be sorted by using the underlay boards or does this sound like a bigger problem?

I have used the underlay boards and the roll out foam before but have never laid the same floor twice with different underlays to be able to see how much of a difference there is between the 2 types.

If there is a larger problem than the type of underlay I may just dry my eyes and leave it as is , however, if people think the underlay boards will make a big difference I am prepared to give it a try.

Thanks again for the replies.

James

get a long strait edge and lay it accross the bit that dips and tell us if its a hump thats flattend when you stand on it or a hollow it falls into!!!

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we are all ------------------still learning

Hi big-all

I have put a straight edge on the floor and there are no raised sections only areas that dip when stood on.

Based on that do you think that the underlay boards would help?

Thanks again for your help.

Cheers

James

sorry should have asked by how much dip

you wont stop the sag unless you flatten the area no amounts off underlay or ply will help
you need to pad out the area by the amount it needs to rise by for example if its say a 10mm hollow a series off hardboard packers extending farther accross the area as they get bigger with no more than 40mm between point off support with the packing secured firmly to the floor

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we are all ------------------still learning