Metal Roof Ridge Vent Gap

Metal roofing ridge cap is the trim placed along the roof s ridge the peak where two roof slopes meet up.

Metal roof ridge vent gap.

Find roof panel closure strips at lowe s today. How to install ridge cap vent for a metal roof for a vented ridge cap. Rising along the underside of the angled purlin until it reaches a gap then rising up to the next purlin and so on to exit at the ridge or gable. Multiply it by 18 square inches the net free air per foot of ridge.

Kind regards jonathan coxen. If you have enough intake it is possible to install them along every ridge of your roof which provides your home with a maximum level of ventilation. To calculate an example of exhaust and intake use 25 feet of roof ridge vent. An aluminum ridge vent has a mushroom shaped profile combined with a wide flange on both sides that sits on top of the roof shingles.

A ridge cap is normally installed only after all metal roof panels and any other trim are in place. This gives you 450 square inches of total exhaust. There is a maximum slope of 16 12 for a roof ridge vent. Vents evenly spaced underneath the roof provide intake.

Ventilation air follows exactly the opposite path. The minimal roof gradient for a ridge vent is a ratio of 3 12. If you have a vented ridge cap it will require a ridge vent such as profilevent. This aluminum cap is the finished product and does not require additional asphalt shingle ridge caps.

Purlins at a 45 degree angle still provide sufficient support for installation of the metal roof panels. The pitch of your structure remains unaffected by this design element. Install profilevent to 1 up slope from the edge of the ridge cap. In other words it s put on last the cap to the job.

I hope i answered your question adequately. There needs to be a 2 inch wide opening at the ridge for ventilation. Have a great day.