UPVC Window Resealing in Manchester

A homeowner in Manchester contacted us after experiencing persistent drafts around their UPVC windows throughout the winter months. The property, a semi-detached house built in the early 2000s, had original window installations that had never been resealed. The homeowner reported noticeably cold spots near the windows, condensation forming between the frame and wall, and significantly increased heating bills.

During particularly windy days, they could feel cold air entering around the window frames, making certain rooms uncomfortable despite the central heating running constantly. The external mastic sealant around the window frames had cracked and shrunk away from the brickwork, creating visible gaps that were allowing air and moisture penetration.

The homeowner was concerned about the long-term implications of moisture ingress, having noticed early signs of dampness on the internal window sills. They were also frustrated by the wasted energy and higher heating costs caused by the drafts. They wanted a professional solution that would eliminate these problems and improve their home's energy efficiency.

Our technician conducted a comprehensive inspection of all ground floor and first floor windows. We found that the external mastic sealant around every window frame had deteriorated significantly. The sealant had hardened, cracked, and pulled away from both the UPVC frames and the brickwork, creating gaps ranging from 2mm to 5mm in width.

We performed a draft test using smoke pencils around the window perimeters, which clearly showed air movement through the failed sealant joints. The homeowner could visibly see the smoke being drawn through the gaps, demonstrating the extent of the air leakage. This explained both the cold drafts and the increased heating costs they had been experiencing.

We also identified condensation damage on several internal window sills where moisture had been penetrating through the failed external seals. The UPVC frames themselves were in good condition, but the lack of proper weatherproofing was allowing the elements to affect the interior. We explained that complete resealing of all external window frames would resolve these issues and provided a detailed quote covering eight windows. The homeowner approved the work immediately.

We began by carefully removing all failed external mastic from around each window frame. Using professional sealant removal tools and scrapers, we extracted the old, hardened sealant from the joints between the UPVC frames and the brickwork. This process required patience and precision to avoid damaging the window frames or the brick edges.

The old sealant had become brittle and came away in chunks in some areas, while in others it required more careful work to remove completely. We ensured that every trace of the old material was removed, as any residue could compromise the adhesion of the new sealant. We also removed loose mortar and debris from the joints.

Once all old sealant was removed, we cleaned the joints thoroughly with wire brushes and professional cleaning solutions. We then wiped down all surfaces with isopropyl alcohol to remove any remaining dust, dirt, or residue. The UPVC frames were cleaned and degreased to ensure perfect adhesion conditions. We allowed all surfaces to dry completely before proceeding with the application.

We used premium exterior-grade mastic sealant specifically formulated for UPVC window installations. This product offers excellent adhesion to both UPVC and masonry surfaces, superior weather resistance, and the flexibility needed to accommodate thermal expansion and contraction of the window frames. The sealant is also paintable, allowing the homeowner to match it to their exterior color scheme if desired.

We applied masking tape to both the window frames and the brickwork to ensure perfectly straight sealant lines and protect the surfaces from excess material. Using professional pneumatic sealant guns, we applied a continuous bead of mastic around each window frame, ensuring the sealant filled the joint completely and bonded to both surfaces.

We worked systematically around each window, applying the sealant in a consistent manner to achieve uniform bead size throughout. Immediately after application, we tooled each joint using professional finishing tools and soapy water solution. This process pressed the sealant firmly into the joint, ensured complete contact with both surfaces, and created a smooth, concave profile that would shed water effectively and resist wind-driven rain.

After tooling all joints, we carefully removed the masking tape at a 45-degree angle to reveal crisp, professional sealant lines around every window. The new white mastic provided a clean, fresh appearance that significantly improved the property's exterior look. The sealant lines were perfectly straight and consistent, demonstrating the quality of professional installation.

We conducted a thorough inspection of every seal, checking for any gaps, air pockets, or imperfections. We paid particular attention to the corners and the bottom sills where water tends to collect. Every joint met our exacting standards for both appearance and functionality. We also checked that the sealant had properly bonded to both the UPVC and masonry surfaces.

We cleaned away any excess sealant or residue from the window frames and brickwork, leaving the exterior spotless. The transformation was immediately apparent, with the property looking well-maintained and weatherproofed. We photographed the completed work for our records and the homeowner's documentation.

The window resealing completely eliminated the draft problems the homeowner had been experiencing. The new weatherproof seals prevented cold air infiltration and moisture penetration around all window frames. The homeowner immediately noticed the difference, commenting that the rooms felt warmer and more comfortable even before the heating came on.

The condensation issues on the internal window sills were resolved, as moisture could no longer penetrate through the external seals. This would prevent any further dampness damage and protect the interior of the property. The homeowner was particularly pleased that the work had addressed both the comfort issues and the potential for long-term structural problems.

Most significantly, the homeowner anticipated substantial savings on their heating bills. By eliminating the air leakage around the windows, their heating system would no longer need to work as hard to maintain comfortable temperatures. They expressed great satisfaction with the quality of the work and the professional appearance of the finished seals, noting that the property looked much better maintained from the outside.

We advised the homeowner to allow 48 hours for the external mastic to cure fully before any heavy rain exposure, though the sealant would be weather-resistant within 24 hours. We explained that full cure time for exterior-grade mastic is longer than internal silicone, but the seals would be fully functional and weatherproof once cured.

For ongoing maintenance, we recommended inspecting the window seals annually, particularly after harsh winter weather. We suggested looking for any signs of cracking, shrinkage, or separation from the frames or brickwork. Early detection of any issues would allow for quick repairs before problems developed.

We provided our 5-year guarantee documentation and advised the homeowner to contact us immediately if they noticed any drafts returning or any deterioration in the sealant. We also mentioned that the mastic could be painted if they wished to match it to their exterior color scheme, though this should be done only after the sealant had fully cured. With proper installation and the quality materials we used, the seals should provide many years of reliable weatherproofing.