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In addition to typical high-low drive threads, GRK’s Caliburn concrete screws have a third groove that captures excess concrete dust so it won’t interfere with penetration.
Plans for an infill project call for a poured stem-wall foundation, but the urban site has limited access for a regular concrete truck. A pumper truck would be ideal, but I'm concerned that the pumped mix won't provide the required 4,000-psi concrete. Is this a legitimate concern?
Floated mortar walls provide a flat, plumb setting bed over irregular wall framing.
Prevent structural problems and failed inspections by avoiding these common installation errors.
Can the roots of a tree actually dry out the soil beneath a foundation enough to cause the concrete to crack?
Can concrete form boards be reused for framing, or does exposure to concrete weaken framing lumber?
An engineered schedule of epoxied rebar pins reinforces the joints.
Q: I'm planning an addition for a client who wants to turn a 22-foot-high wall into a climbing wall. He would like this wall to closely resemble stone, but he doesn't want it to cost as much as natural stone. I've poured a lot of flat concrete, but I have never built something like this - so I...
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