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Update: I don’t soak the perlite. Straight out of the bag.very dusty be sure to wear mask and goggles. 4: 2: 2 1/2 base coat , 4 perlite. 2 sand being 1 part sharp (5mm down) and 1building (soft) sand. 2 1/2 ( two and a half) N.H.L. 3.5. Fibres in the gauging water. Can go on up to 40mm...

Can any one give me advice on how to prepare and render a stack previously painted with that grey waterproofer Flexacryl or Evercryl ?

Note. ; I mistake. The mix is 4:2:2. All ingredients the same, but 4 perlite ,not 6.

Did a 1m x 1m window bay test panel yesterday using a perlite mix. The mix is :a 6:2:2 10l perlite, 2.5l sand ( 1.5l sharp-5mm down and 1l soft/building sand) 2.5l N.H.L. 3.5 with synthetic hair /fibers in the gauging water. 1 cup of N.H.L.5 and 3 cups of silver (kiln dried .5mm down) sand. Mix...

I’ve just read your thread ( the most interesting and relavent to me I’ve ever read) notes on perlite lime render/plaster insulation. I’m a stone mason doing a full time renovation project top to bottom on my old welsh families house in Porthmadog,North Wales. The House is 200yrs old by the...