Material under patio door

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Old 10-18-19, 06:42 PM
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Material under patio door

What material is best under a patio door before you put the door sill on.
does it have to be concrete?
 
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Old 10-19-19, 05:44 AM
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Sliding, French or bi-fold doors can be installed over almost any floor type. I'd let the construction of your room dictate what's underneath the door. Concrete doesn't rot but it's a little harder to sink fasteners. Wood is probably most common but you do have to make doubly sure you do the flashing and water sealing properly. I would make sure to use door trim tape especially with wood.

 
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Old 10-19-19, 06:02 AM
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If something has to go under the door sill I always try to use pressure treated wood.
Usually though they just sit flat on the floor.

As Pilot Dave said the most important thing to get right is the waterproofing and flashing it.
 
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Old 10-20-19, 05:35 AM
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It's the positioning I'm confused on.
with a door to the outside the materials go something like:
Subfloor, opening, air gap, brick cladding.
It's the area where the subfloor meets the air gap - does the door sit entirely on that or do you need to extend into the air gap a bit?
 
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Old 10-20-19, 08:19 AM
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Now I am confused.
Perhaps a picture will help.
 
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Old 10-21-19, 01:50 PM
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Maybe this will help?
http://imgur.com/gallery/629Z1ap

The stud area is going to be removed but that leaves a gap to be filled with? Blocking?

Osb on left.
flooring on right will be removed and become a deck.
How far out does the door sit?
 
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Old 10-21-19, 03:01 PM
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I don't know if this could possibly be more confusing. It's really quite simple.

Doors sit on the plane of the wall sheathing because that's where your WRB (housewrap) is. So if your door has brickmold, that brickmold lays on the sheathing. If it has nailing fin, the nailing fin lays on the sheathing. That determines where the door goes. And every door is slightly different as far as how much the sill nose will protrude.

In your case, you will probably want to extend your subfloor out over to the edge of the framing and searching, then wrap it or flash it with a sill pan as Pilot Dane mentioned above... assuming it's going to be exposed to the elements.

If the sill nose needs additional support after it is installed, that is what trim is for.
 
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