Latest Discussions : Windows & Doors

BV009269

10:07PM | 10/19/15
I am replacing the sill to a door that opens onto our asphalt driveway. When I removed the old, rotted, sill, I found that there was a one inch wide gap between the drive and the house, so it was just dirt. (The drive was installed after the sill, so it could not get beneath the whole width of the sill.) I dug out several inches of the dirt and filled it in with concrete.

I am making the new sill from composite decking to mount directly on the concrete. I chose composite decking because it won't rot or become water damaged and because the mechanical demands on it will be minimal since most people don't step on the door sill.

I have read that composite wood cannot be placed directly on a cement slab because the heat from the slab will warp the decking. I don't think that a one-inch wide strip of concrete would heat up the way a slab would. I think I can justify that by the ratio of the surface area to the volume. This strip of concrete is only a few inches thick while a slab is usually four to six inches thick.

I am considering gluing the sill directly to the concrete with silicon or epoxy. I could drive screws in but I fear that they would break the concrete. To my knowledge, all I need is for the sill to make a water-tight seal to the house and to not slip off.

Can anyone suggest an appropriate glue for the job? Is this idea doomed to failure?

Thanks in advance.


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