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Well, after 2 years of using 6 mil "Greenhouse
Plastic" for my greenhouse glazing,
I decided to upgrade my glazing to double
walled  . This is a sample of the sheet on the left.
There are sheets of plastic on each side
to prevent scratching. I purchased the 4' x 16' sheets from Griffin Greenhouse Supply,
which is local to me. If you live in the
Northeast, where they are located, they will
deliver these free. They have free delivery
for purchases over $100, and believe me if
your going to do double walled it will cost
a lot more than $100. They also had the edges
and seam  pieces on below. I painted these with primer
and then painted them white, as you can see.
They also  had the bolts and rubber backed washers on
the left. As you can see I also primed and
painted these. One thing to keep in mind,
if you are building your greenhouse from
scratch is that if you are using these sheets
from the start of your greenhouse to make
sure that the spacing of your studs is slightly
greater than 16" on center. The sheets
are 4' wide and you'll want the seam edges shown
above to fall on a stud. As you can see above
there is a 1/2 inch space in between where
the sheets go together and bolt the aluminum
 seam to the roof. I had to cut about 1 1/2
inch off of each sheet, because at the time
I built the greenhouse I was not thinking
of using polycarb. The sheets also gets bolted
to the rafters in between with the bolts
and washers, seen on the left. Before you put up the
sheets, you need to seal the open edges,
which are the top & bottom. There is
an aluminum tape for the top and a paper
type of tape for the bottom of the sheet.
The tape stops the cold air flow from getting
between the plays. The paper type of tape
on the bottom allows any water or moisture
that may build up between the ply's to escape
from the paper. There are some suppliers
that have an edging that you can purchase
to put over the tapes, Griffin did not, so
I used "J" molding for vinyl siding
over the tapes on my ends, pictured on the
left.
As you can see in the picture above on the
right the sheets are not as clear or see-through
as I thought they would be. They are, however
a great material for a greenhouse, and have
worked out very well with the large number
of single digit nights we have had this winter.
I extended the roof overhang about an extra
inch and sealed up any seams or gaps with
white silicone. |