|Structural Insulated Sheathing at 800 South Main|
South Main Building Company is putting to use on 800 South Main Street a nifty green building product called Structural Insulated Sheathing (SIS). This product combines insulating properties, structural bracing and moisture resistance, making it preferable to the standard OSB (plywood) sheathing system. The inch-thick panels, with their closed cell foam core, provide an additional R 5.5 of insulation to the wall system, addressing a problem known as “thermal bridging.” While a wall system may have a highly efficient insulation package, framing studs can still conduct interior heat energy through the wall. If OSB sheathing is used, that too will conduct the heat energy to the exterior of the building, diminishing the overall efficiency of the wall system no matter how tight the insulation package. SIS creates a barrier to any heat energy that might move through the studs from the interior of the building, thereby increasing the efficiency of the building’s envelope and saving heating energy and cost.
Finally, the SIS panels are effective in managing moisture in the wall system, addressing a potential rotting problem, which can occur when OSB sheathing is used. Lacking any insulating properties, OSB conducts cold from the outside; in the event that warm interior air makes its way through the wall system, moisture in the air condenses when it comes in contact with the cold, interior surface of the OSB. Such condensation can create a rot problem in the wall cavity.
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