Summerville Roofing: Article About Unvented Roofing
The question of whether to vent the roofing in a residence has only recently become a common one. Standard ventilation is still the most popular choice overall, but homeowners are seeking more varied roof formations that can sometimes make vent setup prohibitively difficult. To work around these complications and capitalize on an appealing set of benefits, some new and existing homeowners are opting to hire professional roofers to seal their Summerville roofing and attic spaces entirely.
An unvented roof assembly is constructed with the goal of an airtight boundary between the attic and the outside world. The soffit and ridge vents included in conventional roofs are omitted completely in newly constructed unvented roofing. Insulation in this setup is typically applied to the attic ceiling from the roof deck peak to the top edge of the walls and anywhere else that may leave an opening instead of the ceiling directly below the attic.
The International Residential Code has determined the specific R-values that an unvented assembly should be required in South Carolina to successfully prevent condensation and meet the IRC standard for energy efficiency. Condensation prevention only requires material with an R-value of 5 thanks to the relative heat of the area. An R-value of 30 is needed to establish an efficient energy pattern.
When built by skilled and knowledgeable professionals, homeowners are often highly satisfied with sealed roofing, particularly in a hotter climate such as that of South Carolina.
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Many see a reduction in their power bills compared to those in similar homes with ventilation. This happens largely because of the improved air current distribution and air conditioning energy that no longer goes to waste by leaving the home.
Furthermore, going unvented can transform an attic into a usable space for homeowners to enjoy with their loved ones. The temperature in a ventilated attic can vary massively from the rest of the home with temperatures rising above 100° in a home that's otherwise cooled. With the insulation structure expanded into the roof deck, this discrepancy in heat is almost eliminated, with attic temperatures averaging only 10° higher than the rest of the house in summer months. An airtight attic also prevents unwanted air patterns from entering the house throughout the year, further adding to the potential for comfort.
Finally, homeowners with unvented roofing in areas prone to storms are better secured than those with ventilated roofing. Without vent openings, humid air from the outside has no opening by which to penetrate the home and create condensation. Rain cannot blow in during storms and wind pressure that could otherwise completely destroy a roof cannot accumulate. This is particularly appealing in a region with any risk of hurricanes.