I have been advised to add straps to a sagging gyprock ceiling to strengthen it after it has been fixed back into place. I see the following products for this on the Bunnings website.
Gyprock CSR 6kg Pre Mixed Cornice Cement
Gyprock CSR 1kg Fibreglass Rovings
Features
Helps add strength to old, sagging ceilings
Use in conjunction with Gyprock Casting Plaster for fibrous plaster or plasterglass surfaces
Use in conjunction with Gyprock Cornice Cement for paper-faced plasterboard surfaces
Small amounts of fibreglass rovings are ‘dunked’ in the plaster mix and applied like a strap over the ceiling joist or batten, making contact with the plasterboard on either side. Make sure dust is removed before the plaster/roving strap is applied. This helps support and strengthen old ceilings that have sagged. It is recommended that the ceiling is propped and screw fixed before the plaster/roving straps are applied.
I have looked at the CSR and Gyprock websites for more information about using their products for this purpose and also contacted them for more information, this is a reply that I have received ....
"You may like to talk to a Gyprocker, as we are the manufacturer only and do not have a great knowledge of some of these techniques created on site by installers. I have heard that one common practice may be to use sisal or hemp along with casting plaster or Cornice Cement. Feather out the ends and stick to the back of the plasterboard while the centre section lays of the framing member. Please note this information is general in nature and should be tested or checked by an installer."
Is there any information available to give more guidance on using fibreglass rovings and cornice cement for this purpose. Other than safety precautions in the roof space and doing a huge cleanup first it looks fairly straightforward, although messy, but any tips would be much appreciated.
