Click here for more general advice on external insulation.
Here are a few examples from the displays in CAT's visitor centre:
External insulation with rigid wood fibre boards
The boards for external use are rigid & impregnated to resist moisture. They are fixed to the wall using specialist screws supplied by the panel manufacturer, and finished with a mesh reinforced two coat render system. This lime-based breathable render allows moisture trapped in the wall to be gradually released. A plinth detail of cork insulation with tile facings is shown; this would be either glued or fixed to the brickwork with plugs & screws. Typical U-value for the improved wall with the thicknesses of insulation shown: 0.52 W/m2K.
External insulation with wood-fibre boards batts in a timber frame with rendered cladding
A grid of timber battens is fixed to the wall - the first, horizontal battens plugged & screwed to the brickwork & the second, vertical, battens screwed to the first. The two layers of insulation between the battens act like a quilt to reduce cold-spots. A layer of breathable but waterproof polyester fabric is then stapled to the outer battens to keep the insulation in place & a final layer of vertical battens added over the top to create an air gap to provide ventilation behind the cladding. This could be horizontal timber boarding or, as here, a rendered calcium silicate board. Fly mesh should be incorporated at the top & bottom of all the ventilation gaps.
External slate hanging with cellulose fibre insulation.
Slate or tile hanging is a traditional way of improving weatherproofing for an external wall. Here this is combined with an additional layer of insulation supported on a timber frame fixed to the original wall. This timber frame is sheathed with a breathable bitumen-impregnated fibre-board & filled with cellulose fibre (recycled newspaper) insulation.
Please contact us if you need to find suppliers of some of these materials.