Enclosed "3-season" porch in front of 16 foot sliders
Enclosed "3-season" porch in front of 16 foot sliders: Where to put maximum r-value?
For a house in south Jersey, I will be enclosing a porch with some sort of glass or plastic. The porch is in front of a 16 foot wall of sliders that lead into the great room of the house. The porch is on the south and has 1.5 foot eaves. The porch is 10 feet deep by 28 foot long. It is in the Pine Barrens. The house is being constructed with 12" double stud walls filled with cellulose (r-40). The windows that are not looking out on the porch are Inline windows with u factors of either .16 or .20 and high SHGC values of .5. Because the house is in a deep pine forest, the amount of pollen is nothing short of unbelievable. My neighbors do not use their porch from late April until late June (they are considering enclosing their porch).
What I would like to know is the value of different options. Obviously, the interior 16 foot sliders would not benefit from the high SHGC since they are completely shaded by the porch. So I can get a low u factor for those doors and not worry about a high SHGC.
But how can I determine the value of enclosing the porch with different kinds of windows? I can cheaply add a storm door system all around the porch, or I can enclose it with plastic. Or I can get more sliders. How would .3 u-factor sliders in both the interior sliders and the exterior sliders work for energy efficiency?
The goal is to keep out the pollen and still be able to open the porch up in July and do it as efficiently as possible.
Posted Oct 2, 2012 5:34 PM ET
Edited Oct 3, 2012 6:16 AM ET
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