Fastening trim to plaster/brick


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Old 12-02-08, 08:51 AM
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Fastening trim to plaster/brick

I am installing trim around some windows. The exterior walls are plaster over brick. What is the best way to fasten the trim to this kind of wall?
 
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Old 12-03-08, 06:35 PM
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Do you know if it is the soft red chalk brick, or a hardened baked brick? And what kind and size of trim are you talking about attaching?
 
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Old 12-04-08, 04:21 AM
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I believe the brick is relatively soft. The trim is almost 5" wide and about 3/4" thick.
 
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Old 12-04-08, 05:07 AM
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Your best bet would probably be to pre-drill and countersink some holes in your trim, and use some 1/4 x 1 3/4" phillips head Tapcon cement screws. You'd sink the heads just below the surface so that you can putty over them with some exterior wood putty or window glazing.

You'll want to install the screws in pairs every 16" or so, so that the trim doesn't want to warp. Holes for the Tapcons must be predrilled with a hammer drill and Tapcon drill bit. If the chalk brick is so soft that it won't hold a screw or the brick is so hard that you can't drill into it, try to hit the center of the mortar joints instead. And don't tighten the screws down too hard or they may strip. If they spin, they're worthless, so bring them up snug SLOWLY. If desired, you could put some quarter-sized dots of adhesive behind the trim as well.

It might also help if you can cut your pieces, then preassemble the trim together, using pocket screws. A Kreg pocket hole jig works well to join butt joints together. A single hole jig and step-bit is about $20 in stores. It will make your joints look a lot better if you use it. You'd make pocket holes in the back of the trim where they won't be seen, assembling the trim like a picture frame (except you'd likely want butt joints instead of miters) and then hang the frame over the window, drill your holes and screw it on.
 
 

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