Polystyrene coving

[Jupiter01]

Is there some science to how the coving sits in the makita mitre saw before it is cut? I am guessing this will affect the fit too.

I had naively assumed that I can lay it flat and cut as per angle bevel used on the wall!

 

[johnny2007]

No, you must position it the same way as it should then be glued.
Have a look if you find online videos, you're going on real basics here.
Sorry to say

 

[Jupiter01]

Sorry. Never done anything like this before and seen some conflicting videos. On the straight and narrow now I think...

 

[johnny2007]

To make it simple, you have to imagine that the saw plate is the wall and the vertical raiser is the ceiling.
So place the coving as it would go on your room and imagine a 45 degree cut as you would see it in finished.
Then set the blade angle.
Basically you have to imagine the saw to be tilted 90 degrees towards you so that the plate is your wall.
I try to make a sketch...

 

[johnny2007]

There you go.
Hopefully it's clearer.

 

[johnny2007]

This is what I did years ago when i had to do lots of coving.
Not worth for a couple of rooms really

 

[Harry Bloomfield]

I have never liked polystyrene coving, it always looks like what it is. I used plaster coving throughout, with pins hammered in above and below, to support it until the adhesive went off.

 

[johnny2007]

Got to agree, but last time i fit coving, the polystyrene was of a tough consistency, matched by the price paid by the landlord.
It was nice to work with , lightweight and had a finish which looked like primer.
Took the paint perfectly.