Drylined Walls Insulation – Design Guidance
In order to reduce thermal bridging found near window and door reveals, install wall insulation directly across the face of the reveal and adjacent to the window frame (as shown in Figure 22). If one is unable to use battens due to space constraints, the plasterboard can be fixed to the wall through the Ballytherm Insulation boards.
One may also find thermal bridging occurs where interior walls join external walls. To remedy this, try running insulation for no less than a metre along the length of both sides of the internal wall. In order to avoid projections in the wall it may be necessary to extend the insulation all the way to the internal corner (see Figure 23).
Correct placement in intermediate floors involves insulation installation along the inner surface of the wall and the joist that parallels it (see Figure 24).
Before installing, prepare the walls by removing any protrusions to maintain an even wall face. Remove skirting boards, copings and architraves. Walls that are uneven may need to be adjusted; service fixtures, including sockets and switches should be removed and re-implemented later. Problems with condensation can be caused by finishes with high vapour resistance. Therefore, vinyl wallpaper, gloss paint and other such coatings must be removed from walls to be drylined.
A good way to minimize perforations in the insulation is to use those formed by the battens that are already in existence. These can be used for service runs. Cavities should be sealed where existing services run through the insulation. It’s possible to adjoin lightweight fittings to the plasterboard, however, heavier fittings should be returned to the masonry.
The weight of heavy horizontal items should be supported with additional battens.
a insulation fitted along face of reveal b insulation extended along face of internal wall c insulation between inner face of wall and joist