Insulating Old buildings

Priest house Broomfield Church Co Monaghgan

On this project we were tasked with externally insulating this single leaf wall Building The existing lime render was defective and need to be removed and replaced. To achieve the U-Value target set to us, we had to add over 240mm of depth to the walls. The existing soffit and roof had to be extended down and out to allow us to achieve this.

Then a rising wall was built from block, up to ground floor level and stepped out from the existing wall. On top of the rising wall, an independent timber stud wall was built and braced to the existing wall. This allowed us to plumb and straighten the walls. Due to the uneven depth behind the studs we needed to use an insulation material that could be blown in and retain the walls ability to breathe.

We chose the Damstatt cellulose insulation {shredded recycled newspaper} and the Gutex Thermowall woodfibre board system. We fixed the Gutex boards to the studs up to a height of 2 meters and then blew in the cellulose insulation at a density of 55kg per m3. This allowed us to evenly fill the voids in the studs and between the existing wall and studs. Then continued this sequence up to the new soffit level.

Then we rendered the Gutex boards with the Gutex thin coat colored plaster and mesh system. This provides the insulation with protection from the weather.