To cap the roof, adhere a line of outside closure strips with butyl tape 10cm from the top of the peak; this is where you’ll fasten the ridge cap to the roof with screws. Apply a bead of sealant on the foam closure, then fit the ridge cap on the peak and fasten with 50mm screws to the roof deck through every rib.
With the cap of the roof complete, all the water that lands on the roof will exit the roof without ever touching the underlayment.
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Source: Family Handyman