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--- hvac:insulation [2022/01/21 23:12]
princess_fluffypants [The effect of "Total" R-Value]
+++ hvac:insulation [2022/01/21 23:14]
princess_fluffypants [The effect of "Total" R-Value]
@@ Line 27: / Line 27: @@
 Total R-Value is the //total// R-Value of a given construction, taking into account all the different R-values of the different sections that it might have. For example, a well-constructed residential wall in a house in a cold climate might have an R-Value of 20((https://www.e-education.psu.edu/egee102/node/2064)) (1/2" plywood, then 1" of Poly-Sty, then a vapor barrier, 3.5" of fiberglass batting with wood studs forming the wall, then 1/2" drywall), while a solid-core door might have an R-Value of 4 and triple-pane windows might have an R-Value of 2.5-3((https://homesteady.com/differences-single-double-pane-glass-8600425.html)).
-Total R-Value is the calculation that works out, when given the square inches/footage occupied by materials of the different R-Values, what the effective R-value of the whole structure will be.
+A basic van insulation build for the walls will have an R-Value of **~5** ((some sheet insulation like 400 thinsulite, some mini-cell foam for the floor and a basic liner to cover up all of the ribs and make sure we don't have any exposed metal)), and a crazier build for ski bums might have an R-Value as high as **8-10** ((Filling every single nook and cranny with 600 Thinsulite, mini-cell foam and poly-sty sheet for the floors, maybe poly-sty for the walls as well covered with plywood or wood slats or even 4-way stretch carpet)).
-Vans are really hard to insulate well in the first place, because they've got a metal skin which is connected directly to metal ribs which act as fantastic (or terrible) thermal bridges. A basic van insulation build for the walls will have an R-Value of **~5** ((some sheet insulation like 400 thinsulite, some mini-cell foam for the floor and a basic liner to cover up all of the ribs and make sure we don't have any exposed metal)), and a crazier build for ski bums might have an R-Value as high as **8-10** ((Filling every single nook and cranny with 600 Thinsulite, mini-cell foam and poly-sty sheet for the floors, maybe poly-sty for the walls as well covered with plywood or wood slats or even 4-way stretch carpet)).
+Single-pane windows (Such as used in cars) has an **R-Value of 1** ((actually closer to .91)).
-Single-pane windows (Such as used in cars) has an R-Value of 1 ((actually closer to .91)). **This is why you really need to insulate your windows!!!**
 Let's look at some examples of how this dramatic heat loss from windows affects the total insulation of your van using [[https://www.cascadiawindows.com/tools/r-value-u-value-calculator|this total R-Value calculator]].

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