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Pebbledash cement render came off first. Mineral wool boards were then adhered and mechanically fixed across the front, side and rear, including the bay window walls and the entrance porch, with the rear detail carried through to meet the extension roof insulation so there is no gap at the junction.
The finish is a highly breathable EWI Pro silicone render, with a grey mosaic render over the plinth insulation and ventilation grilles kept clear. Downpipes were refitted to the new wall line, powder coated aluminium sills fitted to the bay, and the decorative timber repainted.
EWI with mineral wool, Hemel Hempstead
Pebble dash cementitious render being taken down
Insulation to rear elevation, detail showing the EWI joining the extension roof insulation to remove thermal gap
Mineral wool boards being adhered to masonry wall
Mineral wool boards being mechanically fixed to side wall
Rockwool boards being mechanically fixed to front wall
Rockwool boards mechanically fixed to bay window walls
Insulation boards fitted in entrance porch
Downpipes being refitted to suit new wall level
Plinth insulation boards installed around bay window
Highly breathable EWI Pro Silicone Render applied on rear wall
Highly breathable EWI Pro Silicone Render applied on side wall
Bay window completed with powder coated aluminium windowsills
Downpipes re-fitted to new wall level after external wall insulation installed
Grey mosaic render over plinth insulation with ventilation grilles
Insulation & rendering completed on bay window walls with decorative timber re-painted
Insulation & rendering completed on porch walls
If your semi is pebbledashed, cold and you have been quoted for cavity fill that will not work, this is the other way to do it.
