Skirting board obtuse angle with an internal scribe or angle other than 90 degrees. Explained in this article and accompanying video.
The video
How to cut a skirting board obtuse angle scribe.
All the tools used are available from my Amazon store. https://www.amazon.co.uk/shop/spendtimesavemoneydiy
What is an obtuse angle? An obtuse angle is where 2 walls come together at an angle other than 90 degrees.
Bay windows, conservatories and chimney breasts. This is where you will typically find an obtuse angled wall which needs skirting boards fitting around them.
So why cut a scribe joint instead of simply mitring the two pieces together? Cutting a scribe joint is not the easiest thing to do. It takes more time to mark out and cut than a simple mitre. So a lot of people will avoid doing one. I even find professional joiners who don’t do them. But if a mitre joint is used for an internal corner then the joint will always open up as the wood dries out and shrinks back. So a scribe joint is the correct method to use.
Cutting a skirting board obtuse internal corner scribe is similar to cutting a scribe for a 90 degree corner. However it requires a lot more cutting back. For instructions how to cut a scribe for a 90 degree corner then follow the link below for my article and video on that. http://spendtimesavemoney.com/index.php/2020/01/22/how-to-cut-a-scribe-cope-internal-corner-on-skirting-boards-or-baseboards/
The first piece to be fitted just needs the angle of the walls cutting on each end. This is so that it will fit back to the wall. I find this angle using a simple sliding bevel. An angle finder could be used but these can be expensive. And in 20 years of being a woodworker I have never used one.
The angle of the wall can now be transferred onto the skirting board.
The sliding bevel can now be used to set the angle of the mitre saw. If you haven’t got a mitre saw or it won’t tip to the angle you need then you will have to cut it with a panel saw.
In order to find the profile that needs to be cut out for the other piece of skirting board to fit over the piece I have just fitted. I have to divide the angle of the walls in half. Cutting the skirting board at this angle will reveal the profile.
The way I divide the wall angle is as follows.
- Draw the angle of the wall on a piece of board.
- Draw parallel lines to each wall line.
- Where the lines intersect, join these 2 points with a line.
- Set the sliding bevel to this new line and that has divided the angle in half.
This new angle I transferred from the piece of board to the mitre saw again using the sliding bevel. I cut the angle onto the skirting board and this cut revealed the profile that needs to be cut away.
Because of the obtuse angle, the scribe cut needs to be back cut more than the angle of the wall. So I have drawn the angle of the wall on the top and bottom of the skirting board so I know how much I need to cut back. Again I used the sliding bevel to find the angle of the wall and used it to draw the angle.
Now I have to cut the profile. For the straight cut it is best to used a fine toothed panel saw because it is designed to cut straight and the fine teeth will leave a nice finish. For the shaped cut around the moulding it is best to use a coping saw, which is designed to cut complex shapes. All the tools I used can be found in my Amazon affiliate shop at the top of the page.
Throughout the cuts I kept the saws angled back so to back cut. The benefit to back cutting more than you need to is, it’s only the very front edge of the profile that touches therefore there is less chance of any remaining wood fouling the joint stopping it from closing up completely. Also if a little more needs to be trimmed off this can be easily done with a piece of coarse sand paper.
All that is left to do is cut it to length and fix it back to the wall. That is how to cut a skirting board obtuse angle scribe.
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