Is 6mm MDF board suitable to put under sofa cushions
 

Anyone into carpentry here?

I have 2 really sagging sofas and don't wish to spend the money to buy new ones.

My plan is to cut some 6mm MDF board to size and put it under the cushions, i have tried it with a piece of plywood i had lying around, even though it works it isn't strong enough so had cracked with just a little bit of flexing.

Would 6mm MDF board be suitable for the job in hand, would it flex without cracking or is there a cheap better alternative?

I couldn't find a suitable subforum for what i was asking, can we have a subforum for random posts like this?

Re: is 6mm MDF board suitable to put under sofa cushions
 

Depends on the weight being applied. MDF is stronger than plywood but they both have their limitations. More weight = thicker board.

Re: is 6mm MDF board suitable to put under sofa cushions
 

Yes that is why i was asking if someone knew here, i mean i would say normal adult weight is the intended use in this house, maybe i should go up to 9mm thick to be safe though.

Re: is 6mm MDF board suitable to put under sofa cushions
 

You can buy slats that are designed to do this.

I personally wouldn't use MDF, go for something like plywood.

Re: is 6mm MDF board suitable to put under sofa cushions
 

Plywood is what i have already tried and it isnt strong enough unfortunately, it didn't take much flexing for it to crack and MDF is meant to be stronger i think.

I have seen sofa savers on ebay made from strips of MDF but because of the way my sofa is sagging under the cushions i think it is better i get a piece that fits more snugly.

Re: is 6mm MDF board suitable to put under sofa cushions
 

Surely DFS have a sale on :D

Re: is 6mm MDF board suitable to put under sofa cushions
 

Cutting or abrading MDF is risky due to the fumes. In this case thickness would be dictated by the weight to be applied, and I reckon 6mm wouldn't hold up a toddler for long. 20mm would be a minimum for an armchair, but a double or triple sofa width would see it sag and you'd all end up in the middle. I rewebbed a sofa once, and it performed perfectly to the day it was binned many years later. All you need are scissors and a good heavy duty stapler.

https://www.ebay.co.uk/itm/7-Sizes-J...YVDVbMzxTmmkpg

Re: is 6mm MDF board suitable to put under sofa cushions
 

20mm would hold anything in an arm chair.

On my 2 seater sofas it will have support along the 1m front edge and the depth is about 50cm which will have support a little at the back, thinking I will look at 9mm of something stronger than plywood now.

Thanks for all the input.

Re: is 6mm MDF board suitable to put under sofa cushions
 

I'd say it's suitable, but in the long run I'd recommend getting some new foam sofa cushions. They'll be less likely to sag.

Re: is 6mm MDF board suitable to put under sofa cushions
 

It's not the cushions that are sagging.

Re: is 6mm MDF board suitable to put under sofa cushions
 

Ended up getting new sofas.