Burnt Sand Mastic
Used to form joints between timber window and door frames and masonry or rendered masonry, traditional burnt sand mastic has been in use for at least 200 years. It hardens slowly but remains sufficiently flexible for the purpose. It adheres tenaciously to most surfaces.
Supplied in two parts. Burnt Sand + Oil-Driers. Used to form joints between timber window and door frames and masonry or rendered masonry, traditional burnt sand mastic has been in use for at least 200 years. It hardens slowly but remains sufficiently flexible for the purpose. It adheres tenaciously to most surfaces.
It is made by roasting sand on a hot plate or in a small kiln and was originally mixed with oils, lead based driers and crushed chalk. However for many years now, alternative natural driers have replaced the lead products.
Mastic fillets should be neat 20 – 25mm across the diagonal face, mastic should not be used to make up damaged arises or defective renders, these deficiencies should be repaired properly before mastic work commences.
We supply stone repair materials and other lime products for repairing renders
Note: Mastic should not be over painted.
Coverage: A 10L tub will do 50 linear meters of a 20mm x 20mm fillet.
