a little brain teaser....

[Sean Page]

Can anyone shed any light on this....

I've been told that the waterproof matting takes on the same spread/weight ratio as the surface it's being fixed to.

ie. if its fixed to plasterboard it becomes 32kg/m2, and if it's fixed to plaster it becomes 20kg/m2

Obviously taking into account that it's fixed to the substrate using the proper method.

Two questions spring to mind:

a) is this actually true?
b) and if so, then why doesn't plaster take on the same?

 

[doug boardley]

because plaster is structurally weaker than the substrate Sean.

 

[Sean Page]

cheers Doug, that helps a bit.

I wasn't sure if the supplier was pulling my leg or something. I was curious as in the next week or so I'll be fixing trav to a plasterboard wall. Its close on the weight limits, but just within, and the customer then wants the matting.

I was just suprised that the mat didn't change the weights

 

[Scott]

In theory it should be less as the matting is still only bonded to the plasterboard?

 

[DHTiling]

It is true...