I made some nice solid oak baseboards for our house, which I pre-varnished. Now it was time to install them.
Most baseboards are very thin and often made of MDF, which makes them flexible enough to follow walls that are not straight. They are still stiff in the vertical direction, but normally a quarter round is nailed on the bottom edge. The quarter round follows contours in the floors more closely, covering up the gap.
Any remaining gap is hidden with a bead of caulking along the top and in the corners, followed by a coat of paint to hide it all. This makes for a lot less work than my baseboards.
Before I got started, I had to scrape off the line in the paint from the old baseboards. We had the house repainted professionally, but the painters didn't bother to scrape off the paint ridge. "Professional" doesn't always mean good.
I made the new baseboards about 5 mm taller than the old ones to cover up what was left of this ridge after I scraped it.
I also added a slight bevel to where it joins up with the door frame because my baseboards are thicker than the door trim.
The next challenge was the corner. The problem with corners in drywall is that they are never quite square. When drywall is installed, in the corners, a layer of gypsum is applied, then some tape, then more gypsum to cover gaps and make a smooth corner joint. But this builds up the corners up by a few millimeters, which means all the corners curve inward slightly for about the last 5 cm. Not something you'd normally notice, unless you put something square into the corner.
This curvature is a bit too tight to bend the baseboards around, so I used a hand plane to taper the back of the baseboards toward the ends a bit to make it fit with the non-square corner.
I also had a gap under the baseboards because the floor, though it's fairly flat, has some vertical variations on the order of a millimeter or two. I could bend the baseboards a bit to follow gradual curvatures, but for more localized bumps I had to carve the bottom edge to fit.
A mitered outside corner. It looks very nice like this, but the sharp corner makes for a toe stubbing and toddler bumping hazard. So I cut a counter-bevel on each piece on the miter saw before nailing them on.
I put most of the nails along the bottom edge of the boards so if the boards shrink a little from lower humidity in the winter, they are less likely to open up a gap below them. But I still needed to put a few nails in further up to make sure there's no gap along the top edge. I located the studs by searching for the screws with a magnet, then left the magnet stuck to the wall and used a square to figure out where the stud is further down, then nailed it on.
I used a miter joint for the first corner that I did, but it was very difficult to try to get that miter accurate enough. So for the rest of the inside corners, I coped them. Here, using a scrap of trim to mark the profile onto the end of the board.
About half the pieces I installed ended up needing some relief cuts to follow some of the wall curvatures. I switched to cutting these on the table saw because the round blade allowed me to cut away more of the baseboards than with the straight bandsaw cut.
I hadn't anticipated the walls being this curvy. Last time I installed solid oak baseboards, after I built an addition to my first house, I had thinner baseboards and much straighter walls to work with. My framing was more accurate, and I used better 5/8" drywall, which doesn't bend so easily.
Installing all these baseboards was a LOT of work. I really like how they turned out, but if I had to do it again, I'm not sure if I'd do it this way again. Maybe make them thinner and add quarter round on the bottom.
But if they were thinner, it would have been more difficult to shave them down to fit around some of the tighter variations, especially in the corners. As it was, having slightly hollowed out the back of the baseboards made it easier to shave them down where needed. One change I'd make for sure is to add a relief cut on the bottom (added to the example at right to show), which would have made it easier to shave a bit off the bottom where needed to follow uneven floors.
If the door trim was oak as well, that would look really cool. But I'd also have to replace the door frames for that. So it's not something I'll get around to any time soon! I made natural wood door and window trim for the addition on my first house, and I really liked how that looked.
More home improvement projects on my woodworking website