Retrofitting older greenhouses can be difficult. Heat
pipes, irrigation lines, plant light, roof support
columns, and other obstructions may have to be
moved before a system can be installed. Blanket
ends and edges must be sealed tightly to reduce air
exchange between the growing area and the attic.
Figure 8–5 shows typical edge sealing methods. A
retracted blanket will partially shade the greenhouse
by as much as 10%. Storing it along the north wall
or under the gutter will minimize shading.
Figure 8–5. Blanket edge sealing methods.
Track is supported by
wires attached to the ceiling
Insulating blanket
Hinged board
Insulated
sidewall
Insulating
blanket
Insulation
board
Insulated
sidewall
Insulating
blanket
Insulated
bench
Uninsulated
sidewall
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