STIEBEL ELTRON SOL 25 PLUS - Manual (Page 71)

WWW.STIEBEL-ELTRON-USA.COM SOL 25 PLUS | 71
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APPENdIx A
ROOF MOUNTINg dETAILS
If the roof attic is accessible, we recommend fastening the solar collector mounting hardware using carriage bolts through the roof
sheathing and a spanner block that spans across rafters, as shown in Figure A.1. It is important to provide adequate support for the spanner
to keep it from buckling, as shown in the diagram, with two spacer blocks to allow the carriage bolt to clamp tightly to the structure.
Choose large enough carriage screws to allow adequate load-bearing for the snow, ice, and wind conditions likely to be present at the site.
Keep in mind that solar collectors that are not flush to the roof – particularly those that are inclined steeply – can develop significant wind
forces in certain locales.
Pre-drill holes through the roof and mounting blocks. The spacer blocks should be sized to fit snugly between the underside of the roof
decking (sheathing) and the spanner block. Apply liberal amounts of silicone sealant to the bolt hole and underneath the mounting block to
prevent leaks.
It is extremely important to use galvanically-compatible fasteners. Stiebel Eltron mounting hardware (L-brackets, frames, etc.) are made of
aluminum; therefore, stainless steel fasteners are strongly recommended to provide the required strength and protection from corrosion in
harsh rooftop environments.
roof cement
stainless steel nut,
bolt, & washer
neoprene washer mounting block
sheathing
silicone sealant
spanner
wood blocks
sized to fit
mounting L-bracket
2 stainless steel
nuts & washer
roof cement
rafter
sheathing
mounting L-bracket
silicone sealant
mounting block neoprene washer
stainless steel lag bolt
& washer
2" min.
shingles
shingles
Figure A.1: Roof Attachment Using Spanner Block And Carriage Bolt.