Pre-Sealing & Fire-Retardant Treatment for Custom Timber Pergola Posts & Beams in El Cajon, San Diego (2026 Guide)
See why Hardscape Flow spray-treats heavy timber pergola posts and beams on the ground with Class A/B fire-retardant and UV sealer before assembly in El Cajon and East County San Diego—plus 2026 pergola costs.
October 31, 2026