Marine Fabricator January/February 2020 - 48

ShopTalk Interior

TYPE 1 PROJECT EXAMPLE
For an aft mezzanine seating project for a 37-foot
1987 Bertram, the customer selected a Sterling
Silvertex® for the knee-rise and lumbar cushion
areas, which complemented a Seagull Sailcloth
Sunbrella® used for the seat and back cushions.
Marine dryfast foam and polytetra ﬂuoroethylene
(PTFE) thread, as well as Velcoin® Fasteners, were
installed to hold the cushions in place.
We did several sit tests and fabricated a
physical sample to achieve the customer's
desired look; the sample incorporated a kneerise cushion with a rollover contour that is

To allow access to the engine room, the rollover needed
to align with the ﬁberglass lip of the lid. This required
additional foam that was attached to the lower edge of
the forward area of the seat foam.

typically used on a much larger vessel.
SEAT CUSHION FINAL DIMENSIONS:
23 inches long x 20 inches deep x 4 inches for the
low area and 5 inches for the knee-rise
FOAM SPECS:
* Low seat: #50, 4-inch medium ﬁrm dryfast foam
cut 23 x 15 inches
* Knee-rise: #50, 5-inch medium ﬁrm dryfast foam
cut 23 x 6 inches
The design also needed the rollover to align with
the ﬁberglass lip of the lid, which required opening

To produce the knee-rise contour to the top front and
face cushion area, we glued 1-inch foam over the top
and face of the 5-inch foam. A slight taper along the
length of both edges of the 1-inch foam provides a
smooth visual transition for the hi-lo edges of the seat.

to access the engine room. We accomplished
this with an additional 2 x 3 x 23 inch piece of
#50 foam that was attached to the lower edge
of the forward area of the seat foam.
KNEE-RISE TOPPER:
#50, 1-inch medium ﬁrm dryfast foam cut 23 x 15
inches and glued over the top and face of the
5-inch foam to produce the knee-rise contour
to the top front and face cushion area.
We cut a slight taper angle along the 23inch length of both edges of the 1-inch foam
to provide a smooth visual transition for the
alignment of the hi-lo edges of the seat.

48 Marine Fabricator | Jan/Feb 2020

Preparation tips:
* Prepare the two foam sections ﬁrst, as they will provide
the foundation for your pattern pieces. Include notch
indicators for joining panels accurately along both
the length and width.
* Prepare cushion bottom and zipper bands similar
to a standard cushion other than the top and hi-lo
side bands.
* Prepare the knee-rise area from your foam contour.
Pattern and mark a vinyl top and side band. We mark
the vinyl or fabric the same as our foam, taking into
consideration the compression factor and seam size
to produce a tight ﬁt.

Marine Fabricator January/February 2020

Table of Contents for the Digital Edition of Marine Fabricator January/February 2020

Marine Fabricator January/February 2020 - Cover1
Marine Fabricator January/February 2020 - Cover2
Marine Fabricator January/February 2020 - 1
Marine Fabricator January/February 2020 - 2
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Marine Fabricator January/February 2020 - Cover3
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