Figure 35. Double Skin Wall filled with Fiberglass
In the picture there is an outer wall of wood. In between of every stud it is filled with fiber glass, and
after there will be an inner wall. Insulating well the parts that are not transparent will improve thermal
efficiency of the greenhouse.
The total cost for the greenhouse paneling, including the double skin of wood and the fiber glass ranges
from $3046.20 to $3592.00, what is a reasonable price for the quality of these materials.
For the calculations on the prices to insulate the walls of different designs and different materials, refer
to appendix E.
Also, this design of greenhouse gives the optimal heat retention. The values of heat loss vary from
32076 Btu/h and 24057 Btu/h, if the difference of temperature is 45 degrees Fahrenheit.
For more information on heat loss for different designs of the greenhouse and different materials for
paneling, refer to appendix F.
4.2.3 Floor
Our choice for the flooring of the greenhouse is the combination of crushed stone and a special
greenhouse flooring. The first idea was to use pea gravel, but takin in consideration the cost and the
applications, we decided crushed stone would fit our needs better
This special floor is a porous fabric that will facilitate water drainage and also block weed from coming
inside the greenhouse. The fabric is easy to install and it will go on top of a foot deep foundation made
out of crushed stone.