Screwing or gluing a solid piece of wood to a solid core molded composite door

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Forum topic by plang posted 02-12-2019 05:14 PM 564 views 0 times favorited 3 replies Add to Favorites Watch
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137 posts in 4272 days

02-12-2019 05:14 PM

I have a a solid core molded composite door that is only 80 inches long, but I need it to be 84 inches. I just need to know if it will glue and or screw a solid piece of oak or maple to the bottom to add my four inches. Any suggestions would be appreciated. Thanks

3 replies so far

View Scap's profile


137 posts in 844 days

#1 posted 02-12-2019 05:22 PM

The core should be softwood if it’s the kind of door I’m thinking of.

Maybe cut two or three recessed slots and run a long screw in there. Might even consider splitting the difference and do a header and footer…

View anneb3's profile


80 posts in 2471 days

#2 posted 02-12-2019 05:30 PM

Had about the same problem. Roughed up the door and the oak. Then used epoxy smeared on both pieces.

Then drill holes for screws. Then fill holes in door with epoxy and drive in screws. If pieces don’t pull tight, clamp and let set overnight. With no real pressure on door, it should hold.

View clin's profile


1125 posts in 1913 days

#3 posted 02-12-2019 05:36 PM

Even molded doors often have solid wood edges, tops, and bottoms. This is for firm attachment of hinges and doors latches, and the ability to trim the top or bottom to fit a doorway. So I think it is likely you would be gluing solid wood to solid wood.

Also, your solid wood add-on piece won’t expand or contract much along its length. And therefore there should be little to no stress at that joint. Of course as with any solid wood, it will expand and contract more across its width. But this shouldn’t be an issue on a door, and certainly not over a relatively small 4” width.

Of course there will be some expansion and contraction in the thickness as well. But over the relatively thin thickness of a door, I don’t see a problem. However, I would not expect that joint to remain perfectly flush over the years. For example, if painted, I think it likely you may see a line at that joint someday.

If possible acclimate your add-on piece and door in the same room it will be used in for as long as possible. This way they will at least start out at the same moisture level and change the least amount by being in the same environment they will be used in.

In any case, I think it will be just fine.

-- Clin

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