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Why a Commercial Door Lets in Water
Water entering around a commercial door can create slippery floors, damage flooring and walls, contribute to corrosion, and interfere with daily business operations. The source may be the door itself, but it can also involve the threshold, frame, weather seals, exterior drainage, surrounding storefront, or building envelope.
This guide explains common causes of water intrusion, what building personnel can safely inspect, and when commercial door repair or another building professional may be needed.
Water May Not Be Entering Through the Door Alone
Water found near a commercial entrance does not always mean the door is the only source. Rain may pass beneath the door, around the frame, through failed storefront joints, or across an exterior landing that slopes toward the building.
The timing and location of the water provide useful clues. Water that appears only during wind-driven rain may have a different cause than water that enters after snowmelt, irrigation, roof runoff, or repeated pooling outside the threshold.
Why Water May Enter Around a Commercial Door
Damaged Door Sweep
A torn, loose, worn, or missing sweep can leave an opening between the bottom of the door and the threshold.
Threshold Problems
A loose, cracked, low, corroded, or improperly sealed threshold may allow water to pass beneath or around it.
Door Misalignment
Worn hinges, damaged pivots, frame movement, or impact damage can create uneven gaps around the opening.
Failed Weather Seals
Missing, compressed, torn, or incorrectly installed seals may allow wind-driven rain around the sides and top of the door.
Poor Exterior Drainage
Water may collect outside the entrance when the landing, sidewalk, drain, or surrounding pavement does not direct it away.
Frame or Storefront Leaks
Failed sealant, open joints, damaged glazing, or loose framing may allow water around the door assembly.
Where Is the Water Entering?
Under the Door
Water beneath the door commonly points to a damaged sweep, threshold problem, excessive bottom gap, or exterior pooling.
Lower Corners
Water often enters where the side seals, door bottom, threshold, and frame meet.
Latch or Hinge Side
Side leakage may involve missing weather stripping, door misalignment, frame gaps, or wind-driven rain.
Top of the Door
Water above the opening may originate from the header, canopy, wall, roof edge, storefront framing, or failed sealant.
Between Paired Doors
Double doors may leak where the doors meet because of worn astragals, missing seals, or poor alignment.
Around the Frame
Water around the perimeter may indicate failed exterior sealant, loose frame joints, wall movement, or storefront leakage.
Safe Checks Before Scheduling Service
✓ Note where the water first appears during rain or snowmelt.
✓ Check whether water is coming under the door or around the frame.
✓ Inspect the sweep and weather seals for missing or damaged sections.
✓ Look for daylight or uneven gaps around the closed door.
✓ Check whether the door closes and latches completely.
✓ Look for standing water outside the threshold.
✓ Inspect nearby drains, gutters, downspouts, and pavement for obvious problems.
✓ Note whether the leak occurs only during strong wind or rain from one direction.
Why Water Enters Under the Door
The door bottom and threshold must work together to reduce water intrusion. If either component is damaged, incorrectly positioned, or poorly matched to the opening, water may pass beneath the door.
✓ The sweep is torn, bent, loose, or missing
✓ The sweep does not contact the threshold evenly
✓ The door is positioned too high
✓ The threshold is too low for the door bottom
✓ The threshold is loose, cracked, or corroded
✓ The floor or landing slopes toward the entrance
✓ Water pools against the exterior side of the door
✓ Snow, ice, sand, or debris prevents proper sealing
A thicker sweep may not solve the problem if the door is misaligned or the exterior surface directs water toward the opening.
How a Commercial Threshold Can Leak
Failed Sealant
Water may pass beneath a threshold when the sealant or bedding material has separated from the floor.
Loose Fasteners
A threshold that moves under traffic may develop openings around anchors and joints.
Cracks or Corrosion
Damaged aluminum, steel, concrete, or surrounding material may create a path for water.
Incorrect Height
A threshold may sit too low to meet the sweep while still needing to support accessibility and safe passage.
Uneven Installation
An uneven threshold may seal at one end while leaving a gap at the other.
Exterior Pooling
Even a serviceable threshold may leak when standing water rises against the opening.
How Perimeter Seals Allow Wind-Driven Rain
Perimeter weather stripping helps reduce water entering around the top and sides of the door. Heavy use, sunlight, temperature changes, and impacts can cause these seals to wear or separate.
✓ Rubber or vinyl seals are cracked or hardened
✓ Brush or pile seals are flattened or missing
✓ Sections have pulled away from the frame
✓ Corners and joints do not meet completely
✓ The door does not press evenly against the seals
✓ Fasteners or adhesive have failed
✓ The wrong type or size of seal was installed
✓ Thick seals prevent the door from latching
Weather stripping should reduce water and air intrusion without making the door difficult to open, close, or secure.
How a Sagging Door Creates Water Gaps
A commercial door can shift within the frame as hinges, pivots, fasteners, and mounting points wear. This may create a tight seal on one side and a large gap on another.
✓ The gap above the door is wider on one side
✓ The door rubs the frame or drags across the threshold
✓ The latch no longer aligns with the strike
✓ The door must be pushed or lifted to lock
✓ The sweep contacts the threshold unevenly
✓ Hinges or pivots appear loose or worn
✓ One lower corner shows repeated water intrusion
✓ The leak developed as door operation became more difficult
Adding sealant or thicker weather stripping will not provide a lasting repair when worn hardware or frame movement is causing the gap.
Why Aluminum Glass Doors Let in Water
Worn Pile Seals
Brush-style weather stripping may become flattened, dirty, torn, or partially missing.
Pivot Wear
Worn top or bottom pivots can cause the door to lean and lose contact with the seals.
Damaged Bottom Sweep
The sweep may tear, loosen, or wear unevenly from repeated contact with the threshold.
Open Frame Joints
Failed sealant or loose joints in the aluminum storefront can allow water around the door frame.
Glazing-System Leakage
Water may originate around adjacent glass, framing, gaskets, or pressure caps rather than the moving door.
Impact Damage
Carts, deliveries, wind, or forced entry can distort aluminum components and create new gaps.
Why Steel Commercial Doors Develop Water Leaks
Frame Corrosion
Rust near the floor can open joints, weaken the frame, and allow water into surrounding materials.
Door Damage
A bent or dented steel door may no longer contact the frame and seals consistently.
Missing Perimeter Seals
A hollow metal opening may leak when weather stripping is damaged, compressed, or absent.
Threshold Failure
Loose thresholds, cracked sealant, or uneven concrete can allow water beneath the opening.
Frame-to-Wall Gaps
Failed exterior sealant between the frame and surrounding wall may allow water behind the frame.
Incomplete Closing
A closer, latch, or alignment problem may leave the door slightly open during storms.
Why Water Enters Between Double Doors
✓ The astragal or meeting-stile seal is missing or damaged
✓ One door leaf is sagging or misaligned
✓ The inactive door is not held firmly by its flush bolts
✓ The doors do not close in the correct sequence
✓ The bottom sweeps do not meet consistently
✓ A large center gap allows wind-driven rain through
✓ The threshold does not provide continuous protection beneath both doors
✓ Door movement has opened gaps at the upper or lower corners
Paired doors often require coordinated adjustment of both leaves, closers, latching hardware, astragals, and bottom seals.
When the Door Is Not the Main Source of the Water
Landing Slopes Inward
A sidewalk, concrete pad, or entrance landing that slopes toward the building can direct water against the threshold.
Blocked Drain
Debris, ice, or sediment may prevent nearby drains and channels from carrying water away.
Roof Runoff
Missing gutters, overflowing drains, or poorly directed downspouts may discharge water near the entrance.
Snow Accumulation
Snow piled against the building may melt and produce water above the normal threshold level.
Irrigation Overspray
Sprinklers may repeatedly direct water toward the doorway, frame, or adjacent wall.
Wall or Canopy Leakage
Water may travel from the roof, wall, canopy, or storefront and appear at the door opening.
A commercial door company can address the opening and hardware. Drainage, roofing, masonry, glazing, waterproofing, or building-envelope problems may require another qualified contractor.
A Door That Does Not Fully Close May Leak
Weather seals and sweeps cannot perform properly when the door stops short, rubs the frame, drags across the floor, or fails to latch.
✓ The closer is weak, damaged, or incorrectly adjusted
✓ The door rubs the frame or threshold
✓ The latch does not align with the strike
✓ Wind pushes the door away from the seals
✓ Weather stripping creates excessive resistance
✓ Panic hardware does not relatch
✓ An electric strike or lock interferes with closing
✓ The door springs open after appearing to close
The closer should not be adjusted to overpower mechanical resistance. The complete opening should be inspected and repaired.
How Water and Misalignment Affect Automatic Operation
An automatic or low-energy ADA door operator must move the door through the frame and return it tightly to the seals. Misalignment, wind, water, ice, and damaged thresholds can interfere with that cycle.
✓ The automatic door stops before closing completely
✓ The door does not latch after activation
✓ Wind pushes the door away from the seals
✓ Water or ice collects near the threshold
✓ The operator struggles because the door rubs or drags
✓ An electric strike does not align correctly
✓ Sensors or electrical components are exposed to moisture
✓ The system operates differently during storms or freezing weather
When Water Intrusion Needs Prompt Attention
✓ Water creates a slipping hazard inside the entrance
✓ The door will not close, latch, or lock
✓ Water is reaching electrical or access-control equipment
✓ Flooring, walls, framing, or merchandise is being damaged
✓ The door or frame appears bent, loose, or corroded
✓ The opening is a required exit or accessible entrance
✓ Ice forms near the threshold during cold weather
✓ An automatic operator is struggling or behaving unpredictably
Protect the wet area, keep pedestrians away from unsafe conditions, and arrange prompt evaluation when the opening cannot be used safely.
What a Commercial Door Technician Should Evaluate
✓ Door position and perimeter clearances
✓ Hinges, pivots, and mounting hardware
✓ Door and frame alignment
✓ Perimeter weather stripping and meeting-stile seals
✓ Door sweep, automatic door bottom, and threshold
✓ Closer operation and latching action
✓ Lock, strike, panic hardware, and access control
✓ Automatic-operator closing performance
✓ Frame joints, sealant, and visible storefront conditions
✓ Evidence of pooling, drainage, or exterior building-envelope problems
Inspecting the complete opening helps determine whether the water intrusion requires adjustment, alignment, weather-seal replacement, threshold work, frame repair, drainage correction, or another type of building service.
How Water Intrusion Around a Commercial Door May Be Corrected
Door-Bottom Repair
A damaged sweep, shoe, or automatic door bottom may be adjusted or replaced.
Threshold Correction
A loose, damaged, uneven, or poorly sealed threshold may be repaired, reset, or replaced.
Weather-Seal Replacement
Worn perimeter, brush, pile, rubber, or meeting-stile seals may be replaced.
Door Realignment
Hinge, pivot, or frame adjustments may restore more consistent seal contact.
Closer and Latch Service
The closer, latch, strike, or panic hardware may be repaired so the door closes tightly.
Frame or Storefront Work
Loose joints, failed perimeter sealant, damaged framing, or adjacent glazing may require repair by the appropriate contractor.
Why Caulk Alone May Not Stop the Water
Caulk may help when a specific exterior joint has failed, but it will not correct a sagging door, damaged sweep, low threshold, worn pivot, or exterior drainage problem.
Applying sealant in the wrong location can trap water, block drainage paths, interfere with door movement, or make the true source more difficult to identify.
The path of the water should be located before permanent sealing or door modifications are performed.
Call Automatic Door Doctors
Automatic Door Doctors repairs commercial doors with water intrusion, damaged sweeps, threshold problems, worn weather seals, alignment issues, and closing or latching problems. We service storefront doors, hollow metal doors, automatic doors, ADA door openers, commercial door closers, hinges, pivots, panic hardware, fire-rated doors, aluminum glass doors, electric strikes, and access-control-related door hardware.
We inspect the complete opening to help determine where the water is entering and recommend an appropriate door adjustment, hardware repair, threshold, sealing, or replacement solution.
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(303) 500-6105
Denver, CO