MarkAldo11

If we expose the stone wall and loose the render, will this then leave too much exposure for the proposed system. This was the concern of the builder. Thanks all.

The architects are proposing the following internally ; Existing Solid stone walls: Ty-Mawr Internal Wall Insulation System - Sheeps Wool & Woodfibre: existing solid stone wall, breather membrane, 140x50mm C16 regularised timber, treated and dry graded to BS 4978 @ 600mm centres, 140mm Thermafleece insulation fitted between studs, moisture variable vapour check, 60mm T&G wood fibre insulation, lime plaster. The cement render will be coming off and stone will be repointed in Lime.

Thanks Nod. If we go with the modern method of creating a water tight barrier on the inside and back that up with modern insulation, we will definitely have a warmer house and will be protected from the cold air and rain, but will it have issues breathability? New regs propose vents everywhere, trickles in the windows, so there’s plenty of areas for air to escape rather than breathing through the walls. I’m all for tradition but not to the detriment of cold lime walls and expensive heating bills. Cheers.

Hi All, I’m begging a restoration of an old chapel in the north east of England and the property is very exposed to the elements, with lots of wind and rain from the west. There is currently a layer of cement render on the exterior of the building, keeping the westerly weather at bay. Our architects have proposed to repoint the interior and exterior of the stone in lime, batten the internal walls, fill with sheeps wool and then cover with wood fibre and lime render. I understand the logic behind there proposal (breathability etc), however the local tradesman take a different view, as they think the property is too exposed to high levels of wind and rain for the this breathable system. Their recommendation is to keep the weather out by lining the internal walls with cement to stop the wind and rain from entering the property. They have seen lime used in the past in these exposed settings and damp and cold spots in the wall have been too frequent. There is a definitely a divide on this one, and I’m not sure which way to go. Any advice or similar case studies would be a great help. Thanks.