Pa Standards For Roof Ridge Vent

Is adequate attic ventilation now assured by following this requirement.

Pa standards for roof ridge vent. Vent the roof deck. One fastener per tile. The net free vent area nfva shall not be less than 1 150 of the area of the space being vented. Mean roof height feet all roof slopes.

Blocking and bridging must be arranged so they do not interfere with air movement. A minimum of a 1 inch 25 4 mm space shall be provided between the insulation and the roof sheathing at the location of the vent. Air space no less than 1 inch must be provided between any insulation or obstruction and the roof. All rake tiles shall be nailed with two nails.

The whole point to a ridge vent is that it takes air from all along the bottom of the roof line and exits it out the top kind of like a toilet. If the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge. One fastener per tile. With changes to the irc and ibc attic ventilation codes coming in 2012 that will improve the performance of attics installed with a ridge vent the time is right to review the basics of the ridge vent.

The ridge vent is usually rolled into place at the highest peak of a sloped roof over an opening that allows warm humid air to escape the attic. The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Of roof framing to have cross ventilation for each separate space.

The intent of the requirement after all is to establish minimum standards.