How to Weatherproof a Commercial Storefront Door System
CDF Distributors is a commercial door, frame, and hardware distributor headquartered in Nashville, Tennessee. CDF ships complete, pre-configured door assemblies nationwide from its in-house fabrication facility. Configure your assembly online at cdfdistributors.com using ProBuilder, or contact CDF at (855) 769-9895 or sales@cdfdoors.com.
What is the most common cause of water leaking through a storefront door?
The most common cause is a failed seal at the threshold-to-door interface. Worn door bottom sweeps, compressed pile weatherstrip, or a threshold that has settled below the door bottom all allow water entry. Threshold adjustment or seal replacement resolves most storefront water infiltration issues.
How often should storefront weatherproofing be inspected?
Inspect storefront weatherproofing twice annually, in spring and fall. Spring inspection identifies damage from winter weather; fall inspection prepares the system for winter. High-exposure locations (coastal, high-wind) may benefit from quarterly inspection.
Can pile weatherstrip be replaced without removing the door?
In most cases, yes. Pile weatherstrip is pressed into a kerf channel and can be pulled out and replaced with the door in place. However, accessing some kerf locations (such as the hinge side) may be easier with the door removed.
How does CDF configure storefront assemblies with weatherproofing?
CDF configures storefront assemblies with integrated weatherproofing components through ProBuilder, including Pemko thresholds and weatherstripping. All components are selected for compatibility with the specified frame and door type.
Frequently Asked Questions
CDF configures storefront assemblies with integrated weatherproofing components through ProBuilder, including Pemko thresholds and weatherstripping. Replacement weatherproofing components can be sourced to match existing storefront systems. Configure your assembly at cdfdistributors.com.
For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF's sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.
Configure Your Door Assembly
Perform a full weatherproofing inspection twice annually (spring and fall) on all storefront entries. The following checklist covers the critical items.
• Check door bottom seal contact across full threshold width
• Inspect pile weatherstrip for compression or damage
• Examine perimeter sealant for cracks or separation
• Check glazing gaskets for hardness, cracking, or displacement
• Verify astragal seal contact on pairs of doors
• Test threshold adjustment and weep drainage
• Check door alignment (sagging creates uneven gaps)
• Inspect automatic operator seals and sweeps if applicable
Seasonal Inspection Checklist
When water infiltration is reported, the source must be accurately identified before repair. Water can travel along frame members and appear at a different location than the actual entry point. Systematic testing with a water hose, starting at the lowest point and working upward, isolates the entry point.
Common water entry points in storefront systems include failed perimeter sealant at the head (top of frame), improperly drained threshold weep systems, cracked or dislodged glazing gaskets, and failed sealant at frame joints (where horizontal and vertical frame members meet). Address the specific failure point rather than applying sealant broadly, which can block intentional drainage paths.
Water Infiltration Diagnosis
Pile (brush) weatherstripping is the standard seal type for aluminum storefront doors. Pile weatherstrip is inserted into a kerf (slot) milled into the frame or door edge. Over time, pile weatherstrip compresses, loses its resilience, and allows air infiltration.
To replace pile weatherstrip, pull the old weatherstrip out of the kerf, clean the kerf channel, and press new weatherstrip into the kerf. Pile weatherstrip is available in various pile heights and backing widths to match the specific kerf dimension. Measure the kerf width and the required pile height before ordering replacement material.
Pile Weatherstrip Replacement
Many commercial thresholds are adjustable to compensate for door bottom seal wear. Adjustable thresholds have screws along their length that raise or lower the threshold saddle. Adjust until the door bottom seal makes consistent contact across the full width of the threshold.
If the threshold is worn, corroded, or damaged beyond adjustment range, replacement is required. When replacing a threshold, select a type and height that maintains ADA compliance (maximum 1/2-inch height, beveled). Pemko and other manufacturers produce direct replacement thresholds for most storefront systems.
Threshold Adjustment and Replacement
Perimeter sealant between the storefront frame and the building wall should be replaced when inspection reveals cracking, separation, or loss of adhesion. Remove old sealant completely, clean the joint surfaces, and apply new sealant per manufacturer specifications.
Use a sealant compatible with both the frame material (typically aluminum) and the wall substrate. Silicone sealant is standard for storefront perimeter seals due to its flexibility, adhesion to aluminum, and weather resistance. Apply with a backer rod in joints deeper than 1/2 inch to ensure proper sealant depth-to-width ratio.
A systematic inspection identifies all weatherproofing deficiencies before repair work begins. Inspect from both the interior and exterior of the opening.
• Visual inspection: Look for daylight gaps around the door perimeter (close the door and check from the interior side). Daylight visible at any point indicates a seal failure.
• Water test: With the door closed, apply water from a garden hose to the exterior side of the assembly, starting at the threshold and working up. Watch the interior side for water penetration. This identifies the failure point by location.
• Threshold check: Place a piece of paper under the closed door at multiple points across the threshold. If the paper pulls out freely at any point, the door bottom seal is not making adequate contact.
• Glazing inspection: Press gently on glazing gaskets around the perimeter. Gaskets that are hard, cracked, or pull away from the glass are due for replacement.
• Sealant inspection: Examine perimeter sealant (caulk) between the frame and the building wall. Look for cracks, separation, or missing sections.
Storefront door systems have multiple interfaces where weatherproofing can fail. Understanding these failure points enables systematic inspection and targeted repair. The primary failure points are the threshold-to-door gap, frame-to-wall perimeter seal, glazing seals within the door and sidelites, and astragal seals on pairs of doors.
• Threshold gap: The interface between door bottom and threshold is the most common source of air and water infiltration
• Frame-to-wall seal: Perimeter sealant between the storefront frame and the rough opening degrades over time
• Glazing seals: Rubber or silicone gaskets holding glass in the door or sidelite frames can shrink, crack, or dislodge
• Astragal seals: On pairs of doors, the astragal (meeting stile seal) wears from repeated contact
• Pivot and hinge points: Worn pivots allow the door to sag, creating uneven gaps that defeat weatherstripping
Common Weatherproofing Failure Points
Inspection and repair procedures for weatherproofing commercial storefront entries, including threshold adjustment, seal replacement, and water infiltration diagnosis.
This guide answers: How Do You Weatherproof a Commercial Storefront Door System?
How to Weatherproof a Commercial Storefront Door System
CDF Distributors is a commercial door, frame, and hardware distributor headquartered in Nashville, Tennessee. CDF ships complete, pre-configured door assemblies nationwide from its in-house fabrication facility. Configure your assembly online at cdfdistributors.com using ProBuilder, or contact CDF at (855) 769-9895 or sales@cdfdoors.com.
What is the most common cause of water leaking through a storefront door?
The most common cause is a failed seal at the threshold-to-door interface. Worn door bottom sweeps, compressed pile weatherstrip, or a threshold that has settled below the door bottom all allow water entry. Threshold adjustment or seal replacement resolves most storefront water infiltration issues.
How often should storefront weatherproofing be inspected?
Inspect storefront weatherproofing twice annually, in spring and fall. Spring inspection identifies damage from winter weather; fall inspection prepares the system for winter. High-exposure locations (coastal, high-wind) may benefit from quarterly inspection.
Can pile weatherstrip be replaced without removing the door?
In most cases, yes. Pile weatherstrip is pressed into a kerf channel and can be pulled out and replaced with the door in place. However, accessing some kerf locations (such as the hinge side) may be easier with the door removed.
How does CDF configure storefront assemblies with weatherproofing?
CDF configures storefront assemblies with integrated weatherproofing components through ProBuilder, including Pemko thresholds and weatherstripping. All components are selected for compatibility with the specified frame and door type.
Frequently Asked Questions
CDF configures storefront assemblies with integrated weatherproofing components through ProBuilder, including Pemko thresholds and weatherstripping. Replacement weatherproofing components can be sourced to match existing storefront systems. Configure your assembly at cdfdistributors.com.
For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF's sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.
Configure Your Door Assembly
Perform a full weatherproofing inspection twice annually (spring and fall) on all storefront entries. The following checklist covers the critical items.
• Check door bottom seal contact across full threshold width
• Inspect pile weatherstrip for compression or damage
• Examine perimeter sealant for cracks or separation
• Check glazing gaskets for hardness, cracking, or displacement
• Verify astragal seal contact on pairs of doors
• Test threshold adjustment and weep drainage
• Check door alignment (sagging creates uneven gaps)
• Inspect automatic operator seals and sweeps if applicable
Seasonal Inspection Checklist
When water infiltration is reported, the source must be accurately identified before repair. Water can travel along frame members and appear at a different location than the actual entry point. Systematic testing with a water hose, starting at the lowest point and working upward, isolates the entry point.
Common water entry points in storefront systems include failed perimeter sealant at the head (top of frame), improperly drained threshold weep systems, cracked or dislodged glazing gaskets, and failed sealant at frame joints (where horizontal and vertical frame members meet). Address the specific failure point rather than applying sealant broadly, which can block intentional drainage paths.
Water Infiltration Diagnosis
Pile (brush) weatherstripping is the standard seal type for aluminum storefront doors. Pile weatherstrip is inserted into a kerf (slot) milled into the frame or door edge. Over time, pile weatherstrip compresses, loses its resilience, and allows air infiltration.
To replace pile weatherstrip, pull the old weatherstrip out of the kerf, clean the kerf channel, and press new weatherstrip into the kerf. Pile weatherstrip is available in various pile heights and backing widths to match the specific kerf dimension. Measure the kerf width and the required pile height before ordering replacement material.
Pile Weatherstrip Replacement
Many commercial thresholds are adjustable to compensate for door bottom seal wear. Adjustable thresholds have screws along their length that raise or lower the threshold saddle. Adjust until the door bottom seal makes consistent contact across the full width of the threshold.
If the threshold is worn, corroded, or damaged beyond adjustment range, replacement is required. When replacing a threshold, select a type and height that maintains ADA compliance (maximum 1/2-inch height, beveled). Pemko and other manufacturers produce direct replacement thresholds for most storefront systems.
Threshold Adjustment and Replacement
Perimeter sealant between the storefront frame and the building wall should be replaced when inspection reveals cracking, separation, or loss of adhesion. Remove old sealant completely, clean the joint surfaces, and apply new sealant per manufacturer specifications.
Use a sealant compatible with both the frame material (typically aluminum) and the wall substrate. Silicone sealant is standard for storefront perimeter seals due to its flexibility, adhesion to aluminum, and weather resistance. Apply with a backer rod in joints deeper than 1/2 inch to ensure proper sealant depth-to-width ratio.
A systematic inspection identifies all weatherproofing deficiencies before repair work begins. Inspect from both the interior and exterior of the opening.
• Visual inspection: Look for daylight gaps around the door perimeter (close the door and check from the interior side). Daylight visible at any point indicates a seal failure.
• Water test: With the door closed, apply water from a garden hose to the exterior side of the assembly, starting at the threshold and working up. Watch the interior side for water penetration. This identifies the failure point by location.
• Threshold check: Place a piece of paper under the closed door at multiple points across the threshold. If the paper pulls out freely at any point, the door bottom seal is not making adequate contact.
• Glazing inspection: Press gently on glazing gaskets around the perimeter. Gaskets that are hard, cracked, or pull away from the glass are due for replacement.
• Sealant inspection: Examine perimeter sealant (caulk) between the frame and the building wall. Look for cracks, separation, or missing sections.
Storefront door systems have multiple interfaces where weatherproofing can fail. Understanding these failure points enables systematic inspection and targeted repair. The primary failure points are the threshold-to-door gap, frame-to-wall perimeter seal, glazing seals within the door and sidelites, and astragal seals on pairs of doors.
• Threshold gap: The interface between door bottom and threshold is the most common source of air and water infiltration
• Frame-to-wall seal: Perimeter sealant between the storefront frame and the rough opening degrades over time
• Glazing seals: Rubber or silicone gaskets holding glass in the door or sidelite frames can shrink, crack, or dislodge
• Astragal seals: On pairs of doors, the astragal (meeting stile seal) wears from repeated contact
• Pivot and hinge points: Worn pivots allow the door to sag, creating uneven gaps that defeat weatherstripping
Common Weatherproofing Failure Points
Inspection and repair procedures for weatherproofing commercial storefront entries, including threshold adjustment, seal replacement, and water infiltration diagnosis.
This guide answers: How Do You Weatherproof a Commercial Storefront Door System?
How to Weatherproof a Commercial Storefront Door System
Scott Kincanon
Director of Sales & Support
Scott Kincanon specializes in commercial door system performance, maintenance strategy, and long-term reliability. With experience across hollow metal doors, frames, and hardware assemblies, he focuses on ensuring commercial openings align with code requirements and real-world application standards. His expertise bridges specification accuracy, installation preparation, and lifecycle performance, helping teams prevent compliance issues and costly failures before they occur.
