Putting down floor insulation

[Horses Ghost]

I hope this isn't a dumb question that I am trying to overthink. Which direction should I lay my 2" hd250 foam sheeting so my floor will properly drain. The concrete guy was here today and prepped the floor so I can put everything down for the insulation and pex. Does it make a difference which way the sheets lay so the slope will work better to the box floor drains I have? Thanks for all the help.......Mark

 

[nate379]

Not really but whoever did that compacting job needs to do it again. That is UGLY!

 

[jolakki]

Which direction should I lay my 2" hd250 foam sheeting so my floor will properly drain. The concrete guy was here today and prepped the floor so I can put everything down for the insulation and pex. Does it make a difference which way the sheets lay so the slope will work better to the box floor drains I have? Thanks for all the help.......Mark

I dont quite understand what you mean by draining, since those sheets will be under the concrete.
Concrete guy will level the floor so the water goes into those floor drains.
Doesnt matter which way you lay them.
Use the direction that needs less cutting of those foam sheets.

 

[Bigrhamr]

Yes you are over thinking it which is something I do a lot of. Whatever direction makes the least work fitting the panels is fine.
Not to be overly critical but I'll second the comment about the compaction needing work. When you're putting foam down the subgrade needs to look just about like a concrete floor before you cover it up. Otherwise you'll have
voids under the foam and the weight of the concrete is not enough to make the foam conform to the rough surface. Then you'll be relying on the strength of the concrete and whatever rebar you use to support any load you put on the floor. Might get away with it, might not but you are definitely giving up a lot of strength to do it that way. I'd rake that sand smooth, water it down and run a plate compactor over it a few times. Even though this part gets covered up it's well worth being picky over it.

 

[FXR]

Great points. Good thread!

 

[cortez]

It seems like our destiny as humans is to over think and under think things at random.

When you get past retirement age this becomes absolutely clear!!!

 

[GearBeer]

I agree with all of the above, with one additional point. Do yourself a favor and compact the dirt yourself. No contractor you hire is going to willfully put the effort into compacting it sufficiently; it's a crappy, time consuming job that eliminates their opportunity for repeat business. Go rent a compactor and spend an evening or a half day running it around and around and around and around and... you get the point.

EDIT: And don't forget the corners! You may need to add material there, it's worth the time and effort.