how "thick" is plaster or plasterboard?

[sentinal73]

Hi

I have a disused fireplace which im planning on getting plastered etc so that i can put my video and other toys inside of it on shelves

The current width of the hole down to bare brick is 450mm

The plasterboard I've seen is 9.5mm thick

So once lined with plasterboard that would take the width of the hole to 431 mm

A piece of equipment that i am planning on installing is 425 mm

I realise that this is probably too tight, espcially once it has been skimmed also

Is there anyother way to do this?

I've seen MDF and plyboard is thinner than the 9.5mm plasterboard, but i presume that you cant skim onto MDF and plyboard?

can anyone help?

 

[noseall]

you could ply line the apeture then fix a decorative architrave to the front edge.

the ply could be painted.

 

[sentinal73]

thanks!!!

I will be plastering both sides and above the apeture.

could i ply line the inside as you suggested, plasterboard the sides and above, and fill in any gaps with filler, sand down etc?

Thus doing away with a decorative architrave to the front edge.

I'm trying to achieve a "clean" look

thanks

 

[noseall]

Thus doing away with a decorative architrave to the front edge.

I'm trying to achieve a "clean" look

thanks

it's back to 9.5mm plasterboard then i'm afraid.

 

[breezer]

if this fire place has a chimney you should either not put a "lid" in there or leave a ventilation hole / grille

 

[sentinal73]

thanks, am planning on putting in a ventilation grille and a cowl? on the chimney