On a tilt-up warehouse, the roof usually gives up first where the membrane climbs the concrete parapet and stops under a termination bar that was fastened into a wall full of hairline cracks. The panel moves a little with every hot afternoon and cool night, the sealant joint along the bar dries out, and rain finds the gap and runs down the inside face of the wall. The owner sees a damp stripe above a dock door and assumes the field of the roof is worn out, when the field is often sound. Warehouse roofing in Pasadena, CA is mostly the work of getting these edges right, because the open acres of membrane in the middle are the easy part. We rebuild the termination, set counterflashing into a reglet where the wall allows one, and leave a sealant joint that will still be tight after another heat spell like the October 2023 advisory that put highs near 100.
Warehouse Roofing in Pasadena, CA
Skylights, Smoke Vents and Fan Curbs
A warehouse roof is a large quiet field with a handful of holes cut into it, and the holes are where the trouble collects. Skylight lenses craze and shift in the sun, smoke vent hatches rust at the hinge, and exhaust fans sit on curbs whose flashing was lapped in a hurry by whoever last changed the motor. When a lap opens, water follows the curb down into the building and lands on a pallet row a few bays away from where anyone thought to look.
We treat each curb and hatch as its own piece of detail work. The old flashing comes off, the substrate is dried and repaired, a new base flashing is formed and lapped so water sheds over every seam, and the counterflashing goes on after it, never before. Fans and vents are reset on level curbs, and a cricket goes upslope of any curb wide enough to dam water. The membrane around them is fitted by hand instead of stretched, because a sheet held under tension at a corner pulls free the first hot August.
Lamanda Park Units and Small Flex Buildings
Pasadena has very little industrial space, and most of it is gathered along East Foothill Boulevard through Lamanda Park, in warehouse and flex units, some of them only a few thousand square feet. Units such as the ones at along East Foothill Boulevard leave little field between the edges and the penetrations. On a small roof like that the details carry nearly all of the cost and nearly all of the risk, and a patch layered over a patch is a common history.
Before we quote anything on these buildings, we walk the whole roof, find out which tenant owns which curb, and map how each layer of old roofing is stacked. That tells us whether a repair, a recover or a tear-off fits, and it keeps us from replacing a membrane that is only failing at three corners. Units in East Pasadena and Lamanda Park share walls and drains much as other flex industrial roofs do, and we plan them with the same attention to both.
Heat Load and the Cool Roof Threshold
Pasadena has recorded 113 degrees in June, and a dark warehouse roof under that sun bakes well past the temperature of the air. A reflective surface keeps that swing smaller, which is why the state energy code puts a floor under how reflective a low-slope commercial roof must stay once it has aged: 0.63 in solar reflectance and 0.75 in emittance, with a solar reflectance index of 75 as the alternative path. The floor applies to every new roof, and to any alteration large enough to reach half the roof area or 2,000 square feet, taking whichever number is smaller.
That threshold matters to a warehouse owner, because a large repair can cross it without anyone intending to. We look at how much of the roof the scope actually touches before the work is priced, so the owner knows whether a cool roof installation is part of the job or only a good idea. Where it is required, we choose a membrane that holds its reflectance as dust and heat age it, and we say plainly what the sheet will look like after a few summers instead of what it looked like in the brochure.
Where a Wide Roof Sends Its Winter Rain
Roughly 20 inches of rain falls on Pasadena in a normal year, mostly in a few winter months, and the slope of the San Gabriel Mountains adds about 6 inches beyond what downtown Los Angeles receives. A warehouse roof catches that water over a very large area and sends all of it to a few drains. If one sump is a little high, or a scupper box was cut an inch above the roof surface, the water stands behind it and the membrane under the pool ages faster than the rest of the roof.
We check the low points after a rain, not on a dry afternoon, because that is when a drainage mistake shows itself. Crickets, tapered insulation, new sumps and correctly sized roof drains and scuppers are the usual cures, and each one is built into the roof instead of added on top of it. Where the problem is already standing water, our approach to ponding water repair starts by finding why the water stays, not by covering the stain.
Keeping Stock Dry While the Roof Is Open
Few owners can empty a warehouse for a reroof, so the plan has to protect what is underneath. We phase the work in bays, close each section the same day it is opened, and keep torches off the roof entirely when product or racking sits below. Hot-air welded sheet, cold adhesives and mechanical attachment let the building keep shipping while the crew works overhead.
A condition survey comes first, and an infrared moisture survey often shows that wet insulation covers only part of the roof, which can keep the scope smaller than the owner feared. For tenants that share a building, an occupied building reroof needs notice, access rules and daily cleanup. If a storm opens a roof overnight, we answer at any hour and make the building watertight first, then sort out the permanent repair in daylight. Owners running a distribution center face the same questions, with more trucks.
Commercial Roofing Questions
How do I know whether my warehouse needs a repair or a full replacement?
Start with how much of the roof is actually wet. Moisture that stays near penetrations and edges points to a repair, while insulation that is saturated across the field points to replacement or a recover. We confirm the answer with a hands-on walk and an infrared survey, then write down what we found on each section of the roof so the owner can see the boundary between sound and failed areas.
Will a patch on one section trigger cool roof requirements for the whole building?
The rule looks at the area an alteration covers, so a small repair in a corner does not reach the threshold, while a large section often does. Before pricing, we measure the proposed scope against both limits, since the smaller one governs.
Why does my warehouse leak at the dock wall when the roof is only a few years old?
Look at the parapet and the wall termination first. A termination bar set into cracked tilt-up concrete, with a sealant joint that has dried and split, lets rain run down the inside face of the panel. Newer membrane does not help if the edge detail is original. Rebuilding the termination and counterflashing usually ends a leak that looked like a roof failure.
What happens to my racking and inventory during a tear-off?
Product stays protected because we open only as much roof as can be closed the same day. Temporary tie-ins seal each section against rain overnight, and we cover vulnerable stock if the schedule requires work above it. Tell us which aisles and dock doors cannot be disturbed, and the phasing plan is drawn around them before anyone mobilizes.
Walk the Edges With Us
Bring us the address and the dock wall or curb that worries you. We will look at the terminations, penetrations and drains on your warehouse roof, because those details decide how long the roof lasts, and we will put what we find in writing. Call at any hour if water is already inside.