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CertainTeed Vinyl Siding Installation Guide
26
Measuring
Before ordering accessories, you also have to determine the width
of the J-channel into which you will fit the vinyl siding. To do this,
you must first determine which of two methods you will use to
apply sheathings or underlayments. This is covered in more detail
under “Sheathings.”
NOTE: Refer to product catalog for product accessory
recommendations and availability.
Starter strip: Measure along base of building.
J-channel: For siding installations, measure around doors
and windows, under eaves, at rake edges of gables where
dormer meets roofline, and anywhere else required to provide
a finished appearance.
For soffit, measure along wall under eave and along fascia board.
For porch ceilings, measure along perimeter of the porch area.
F-channel: For soffit, measure along wall under eve.
For porch ceilings, measure along perimeter
of the porch area.
3-1/2" and 5" Lineals: For casing, measure along perimeter of
doors and windows. For gables, measure at rake edges of gables
where dormer meets roof line.
Undersill trim: Measure above and below windows and above
doors and top course of siding below soffit.
Soffit H-bar: Measure diagonals at all eave corners.
Outside cornerpost: Measure length of outside corners.
Inside cornerpost: Measure length of inside corners.
NOTE: If you plan to use J-channel instead of inside corner-
posts, remember to double this measurement and add the
total to your entry for J-channel.
Dual undersill trim: Measure along top of wall where siding
will meet eaves.