I’m thinking about installing a new French door in by basement. My question is what is the best way to attache to the door to the concrete block? Should I cut the opening to the required rough opening size and attach the door directly to the block. Or should I make the opening larger, and frame the opening with pressure treated wood first and attach the door to the wood?

Thanks

labman

I think the latter would go easier being able to use finishing nails to hold the frame to the 2 x 4's. However, you might need very wide trim to run from the door frame to the block over the 2 x 4's. If the wall is finished, perhaps you could add drywall to cover the gap. Maybe use two 2 x 4's to give support on both sides.

atticguy

I agree with labman. no matter what type of material opening you have, i would always frame in with wood (and in this case PT-wood). this allows for much easier transitions down the road. also, later on- if the door ever gets changed out, all of the wear and tear on the block could lead to structural compromises. framing it in acts as a 'sacrificial edge'. as for the block width, of course you put the door even with the outside edge of the basement wall. then i would just install extension jambs ripped to the correct width, if needed. that might cut down on those nasty and hard to do drywall corners. especially right beside a doorway, which might get bumped often.

just my two cents...

good luck,

atticguy