Replies

1. 
   nater | Apr 03, 2008 03:10pm | #1

   A raised greenhouse isn't really a good idea in my opinion. Part of the function of the floor in the greenhouse is storage of heat to keep the greenhouse warmer on those cold days. I guess if it has to be raised, concrete, or pavers would be the best choice to help regulate the temperature. Having a raised deck type floor would cause large temperature swings.

1. 
   chuck3 | Apr 03, 2008 03:25pm | #2

   Good point on the temperature swings...I envision the perimiter of the deck framing to be ground-rated pressure treated 4x6, raised only slightly from ground level, which should help minimize your concern.  Also, customer intends to install thermostat controlled gas heat.

2. 
   MikeHennessy | Apr 03, 2008 04:18pm | #3

   I agree with Nater. Raised greenhouse is not the best design due to loss of heat. But if the HO insists, I'd build it just like any other raised structure -- insulated knee walls with proper foundation depth, insulated floor. For a greenhouse, I'd probably want to build a stiff floor, covered with Ditra & some no-slip tile or pavers, and a floor drain.

   If you get to build it on the ground, I'd still insulate the perimeter a bit, and put in a gravel floor (brick pavers over it would be nice), maybe 6" deep, for drainage, with a perf pipe in the gravel to direct excess water to daylight. In the long run, a cheaper, nicer alternative to a raised floor.

   I've built & used greenhouses & it's really nice to have the ability to hose the place down without makinig a muddy mess. The gravel base also holds some moisture to keep the humidity up -- pretty critical if you're using gas heat in the cold months.

   Mike Hennessy
   Pittsburgh, PA

3. 
   Piffin | Apr 04, 2008 01:22am | #4

   IPE` is the wood you want there

    

    

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