Lag-bolts should be located as close to collector mounting points as possible. C-channels require at
least two lag-bolts per collector per length.
1. Once appropriate lag-bolt position has been determined, drill about 5” (12.7 cm) into rafter with a
long (min. 6”) ¼”-drill bit (Fig. 5.2.3). Fill hole with polyurethane roofing sealant.
2. Apply roof-sealant to one side of black nylon spacer. Align drilled hole with nylon spacer hole and
stick spacer to roof (Fig. 5.2.4).
3. Place C-channel over spacer. Insert lag-bolt through washer. Place lag-bolt with washer in place
through C-channel slot and nylon spacer into pre-drilled, sealant-filled rafter hole (Fig. 5.2.5).
Tighten lag-bolt with ratchet (and extension) or drill driver (with extension). Do not tighten
completely until all necessary C-channel lag-bolts are threaded into rafters.
Fig. 5.2.3 – Pre-drill lag-bolt hole.
Fig. 5.2.4 – Roof-sealant application.
Fig. 5.2.5 – Securing C-channel with lag-bolts.
Solar Collector
Installation Manual
14
Module 4
Summary of Contents for EWRA1
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