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Question DetailsAsked on 4/23/2015

ventilation attic specialist in New Jersey?

My house has hip roof. 18 Lx22 (4 corner) Can I have a hip vents and ridge vents to make 50/50 exhaust and intake. Total size of rood s 1380 sq ft. do I need 22 hip events?

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As far as an expert - you would have to ask around for recommendations - a few roofers, some insulation contractors, some energy auditors, some HVAC contractors, some architects/engineers are trained and experienced in this area, but not a large percentage.

I would say do some research yourself first, and read some of the comments in the Home > Roofing link - a few of the most pertinent recents ones linked below.

Definitely, passive ventilation is to be preferred from a reliability and energy-efficiency standpoint, but some flat and full hip roofs are built so it is hard to retrofit economically. I have done designs using the perforated HDPE/PVC drainfield pipe connected to fans to provide full-attic-width air supply or removal, but that sort of solution is a poor second choice if natural ventilation from eaves to ridge vents can be done.

Note the comments in a couple of the following responses regarding ridge vents low down on hip ridges in snow country where that colder part of the roof can result in ice damming and water backup into the vents, and also the one comment that links to a ventilated fascia board or cornice product as an example, the same sort of thing can be done in many ways, but be sure to provide bird/insect screening. However, do NOT remove a 2x wood fascia board and replace with only soffit ventilation material - the ends of the rafters needs to be rigidly and strongly tied together with the fascia board or equivalent wood blocking (which could be ventilated with holes) so the rafters do not twist in the overhang area. And of course and cornice or fascia ventilation entry points need to be protected by dripedge or flashing as needed to prevent dripping water, blowing water coming off the shingles, or gutter ice damming from flowing into them; and to ensure easy gravity drainage back out if any does get in.

As for the 22 hip vents - usually one uses regular continuous ridge vent - which cover cuts through the roof and sheathing at each rafter bay, or a continuous slot in most cases where the integrity of the sheathing at that point does not contribute to the strength of the roof. Google - ridge vent images - for pictures of ridge vents and how the air slot under them is cut in the roof- usually just a 1 foot wide or so slot cut through the roofing (if there) and sheathing with a skil saw - being careful of course not to cut into the rafters.

Answered 5 years ago by LCD

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