DIYbanter - touch up roughcast

"sandman112" wrote in
message .uk...
im needing to repair some roughcast that has fallen off the side of the
house, its only about maybe 1m squared area and its on a bottom corner,
doesnt sound like it should be to hard so i fancy giving it a go myself,
anyone got any pointers on how to go about it, also how to get the colour
match is there anything perticuler i should be doing

cheers

Don't know how easy it is to touch up a small area of roughcast and blend it
in. I did a wall with roughcast made up something like 1:1:6
lime:cement:aggregate ( sand to 3/8", I sieved larger stuff to get that
size ). Make up a fairly runny mix, a fair bit runnier than would be any
good for bricklaying ( it should slump level ) then throw at the wall with a
fireshovel or somesuch.

Continue to splat it on until it is fairly even in texture. You will have
trouble blending it in with what you've already got. If your roughcast is
fairly fine in texture use a gritty sharp sand instead of aggregate, or a
Tyrolean machine applicator.

I found it sticks no problem, but remember to put down a sheet to catch what
falls off. You will need to experiment to get the texture right - try on a
sheet of plasterboard first. Getting a consistent texture is difficult too,
try and fling the roughcast on fairly square and experiment with amounts on
your shovel - small amounts probably build up a more consistent pattern but
take longr. Vary the direction you fling the roughcast, i.e. up-down,
left-right, diagonal x 2 etc.

My result in the end was good but really quite rough and textured, and a few
spots needed well aimed splats added to build them up, and a few places
needed pinnacles knocked off. To finish, I painted on a thick limewash which
smoothed out some of the finer rough texture. As for colour, add cement
colourant or brickdust etc to match colour. Remember it'll dry lighter.

Andy