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SmartVent –

How to Miter SmartVent on a Transitional Roof

Patent numbers 6,212,833 ,9,022,845 & 6,447,392 issued by the United States Patent & Trademark Office.

When installing SmartVent on a transitional roof you should use the following steps to achieve the best results for both curb appeal and ventilation.
SmartVent Mitered
Step 1
Cut 45° angle with razor knife starting from the tapered edge working towards the Fabric exterior.
SmartVent Mitered

Step 2

Cut angle.

Discard the cutoff piece

Step 3

Discard cut off piece.

SmartVent Mitered

Step 4

From another piece of SmartVent

Cut 45° angle with razor knife starting from the opposite side tapered edge working towards the Fabric exterior.

SmartVent Mitered

Step 5

Install tight & cut flush with lift edge (continues in step 6 )

SmartVent Mitered

Step 6

Using a square & razor knife.

SmartVent Mitered

Step 7

Place end cap to the SmartVent™ & place fabric 1/2 below.

SmartVent Mitered

Step 8

Nail SmartVent™ end cap in place with fabric 1/2 showing.

SmartVent Mitered

Step 9

Take the fabric and wrap it over the vent & nail it tight. Install ice & water membrane & shingles.


Step 10

Finished Installation.

Ensure shingle overhangs 1/2” past the lift edge

SmartVent Mitered

SmartVent is a tapered, under shingle plastic product designed for installation along the soffit edge of the roof or the facing edge of dormer rakes and goes virtually unnoticed. It allows air to flow freely through the 1″ roof decking slit providing more than adequate soffit ventilation to maximize ridge vent effectiveness. This is extremely important since most ridge vent products require an equal amount of ventilation at the soffit in order to work properly. SmartVent, when used at both soffits, has a total NFA rating of 18 sq. in. per foot (or 9 sq. in. per foot on each side of a standard gable roof).

Click here for SmartVent Specifications

Most houses with ridge vents do not have the proper soffit ventilation required because attic insulation blocks the soffit vents. SmartVent allows cooler air to enter under the shingle, through the 1″ roof slit and out the ridge vent providing superior air flow and attic cooling.

Click here for an expanding list of SmartVent Dealers. If no dealer is located near you please give us a call at 1-800-622-4455 and we will be happy to locate a dealer for you.



Questions about SmartVent?