STIEBEL ELTRON SOL 25 PLUS - Manual (Page 72)

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If the roof deck is inaccessible from below, the collector mounting hardware may be fastened using lag bolts through the roof sheathing
and into rafters from above, as shown in
Figure A.2. Lag bolts must solidly penetrate rafters or other structural members to provide solid
anchoring strength. The location of these may be determined by tapping the roof with a hammer. Drill holes through the roof (several
sizes smaller than the bolt) to assure a tight fit. The threads of the lag bolt should penetrate at least two inches (2”) into the structural
member itself (below the roof sheathing
)A1 . It is therefore critical that the installer determine the length of bolt necessary to give the depth of
penetration required. Apply liberal amounts of silicone sealant to the bolt hole and underneath the mounting block to prevent leaks. After
tightening the bolt, apply more sealant over the entire assembly.
There are other, well-engineered roof fastening systems available that the installer may wish to consider. In all cases, it is prudent to contact
the local code enforcement office to determine the appropriate means of attachment to roofs or other structures.
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.2: Roof Attachment Using Lag Bolt Into Rafter.
A1 NOTE: Installers must ensure that no deterioration (e.g., rot or water damage) has occurred to the underlying members; if the roof structure is compromised by deterioration
or cracking, it will be necessary to repair it before mounting the solar equipment.