I have to repair some window sills right through exterior to interior
decorated surface. The window is a 6 facet bay of soft wood timber that I
shall retain due to budget and aesthetics. The sills were straight through
1 piece cold bridging concrete but have disintograted, so I shall likely
recast in situ. I have just 8 inches of brick depth to play with (2 skins of
standard clay 4inch brick and no cavity). I won't remove the windows. There
will be 40mm insulated p.board internally to finish. What is the
construction method I should use with these givens? DPC? seal to lower edge
of window frame?
Links to construction diagrams would be great!
perhaps Im not hip to all the "lingo" (> recast in situ, DPC?) but I
have no idea what you are talking about?
It sounds like you are asking how to re-form and pour the concrete back
under these windows is this correct?
Yes essentially. Though I have some idea, I just want to make sure
(naturally) I do right. DPC = damp proof course, I expect this is a cavity
tray, though retro fitting one I expect I might as well give up now finding
suitable dimensions off the shelf, the blue 1200? guage poly liner I expect
Stainless or galvanised reinforcing or is it really neccessary? And can I
cast the piece in one piece, this will be 4 metres long on a curving bay.
To get a goof finish on cast concrete the mix should be a wet than usual,
but I need to finish the top surface with a fall, getting the mix the right
consistency to do both might be hard.
Rebar is necessary but neither of the above is, standard steel is fine.
Carefull on the water... if you are concerned about the appearance you
can always go back and "face" the exsposed areas with a sand and
cement mixture. if you really want a smooth appearance line the forms
with plastic sheeting and pour into these++++CAUTION++++ DO NOT DO THIS
ON A WARM DAY as plastic accelerates the process greatly. after you
have the forms filled using a palm sander place a stick of good size or
even a leftover piece of rebar into the concrete and place the sander
on the bar (move this around to different places in the form) this will
vibrate the mixture removing air and making the form voids fill
completely...just dont over do it or all the rock will fall to the
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