Hi. I've been a traditional renderer for around 15 yrs and would like to use the new silicon renders available a.my question is can I put a 4 to 1 sand cement scratch coat on and then finish with say Weber rend as my top coat... would I have to prime the scratch coat prior .and would it make a difference to the top coat what retardant went in to the scratch coat. Thanks
silicon render over sand cement scratch coat
- Thread starter jacko001
- Start date
Hi Fran really appreciate your knowledge on the product. Just a couple of other queries if ok to ask .
How long would you leave the scratch coat to set a.would I need to prime it can I incorporate mesh in scratch coat or Weber top coat.
And. Typical what is the setting time a.would you rule with a feather edge then sponge up .and what's the min max depth of top coat.
Sorry about all the questions mate.like I said all I've ever done is sand c. The house ile be doing is a typical late 70s concrete shutted building you know the one the walls look like pebbles.
Again much appreciated fran.cheers lee.
How long would you leave the scratch coat to set a.would I need to prime it can I incorporate mesh in scratch coat or Weber top coat.
And. Typical what is the setting time a.would you rule with a feather edge then sponge up .and what's the min max depth of top coat.
Sorry about all the questions mate.like I said all I've ever done is sand c. The house ile be doing is a typical late 70s concrete shutted building you know the one the walls look like pebbles.
Again much appreciated fran.cheers lee.
Fran06
Member
No worries,if I was doing it over old pebble dash I would give the dash a good wash first then scud the dash with a ten sand to one bag of cement mix then scratch and take time to get it nice and straight and set beads properly etc then u would wait till the scratch was nice and hard and give it a really good drink of water and I would first coat it when still a www bit wet then second coat it and rule with a 6 or 8 ft feathered edge then rub it up with a float and scrape out when ready depending on time of year.i would try a small wall first till u get the hang of it and let the k rend mix down in mixer don't add to much water to quick!! As for mesh and that tbh I never used it but sure other lads could help u out on that.hope this helps lee.
