J & L Insulation, Inc. on Maine Avenue in Lakeside holds CSLB license #472996 under the Insulation and Acoustical classification, installing fiberglass batt, blown cellulose, and radiant-barrier systems for new-construction and retrofit projects since 1983. Attic insulation upgrades pair directly with HVAC efficiency gains measured by Precision Temperature, whose load calculations factor in R-value improvements when sizing replacement equipment for Lakeside's inland climate extremes. The firm is a Johns Manville Certified Insulation Contractor serving San Diego, Imperial, Riverside, and Orange Counties with residential, commercial, and multifamily scopes that include attic removal, wall cavity fill, fire-stopping, draft-stopping, and acoustical sound control. Roof-deck insulation installed beneath new sheathing laid by Ford Roofing reduces radiant heat transfer through the assembly, meeting Title 24 energy-compliance thresholds for both prescriptive and performance paths. Product options include Johns Manville fiberglass batts in R-13 through R-38 densities, loose-fill cellulose blown to ASTM C739 settled-density specs, and perforated radiant-barrier sheathing rated to block 97 percent of attic radiant heat gain.