The Bargain Import Headache
Buying a cheap plastic back door online backfires completely during the summer months.
Homeowners believe they found a great deal online, but the door panel becomes completely impossible to lock by July. The handle refuses to lift smoothly. This lock failure forces the homeowner to shoulder-charge the frame just to turn the key.
Missing Steel Reinforcement
Hollow extruded uPVC requires internal structural strength to withstand thermal changes.
Quality trade manufacturers slide heavy, galvanized steel box sections straight inside the main plastic chambers. Budget internet suppliers skip this vital metal reinforcement entirely to slash production costs and shipping weights. They sell raw, hollow plastic masquerading as a secure external house door.
The Sun Expansion Warp
Summer heat bakes the outer plastic skin of the door leaf daily.
White uPVC expands rapidly under direct UV rays. Darker foils like Anthracite Grey absorb this heat at double the rate. Hollow plastic frames have no internal steel skeleton to resist this thermal movement. The middle of the unreinforced door leaf expands outward, bending the entire slab into a permanent banana shape. This thermal warp leaves wide gaps at the top and bottom corners, letting drafts blow straight into the kitchen.
The Lock Misalignment Failure
Thermal bowing throws the critical multi-point locking points completely out of square.
The top and bottom steel hooks shift away from the frame by up to 10mm, missing the metal keeps entirely. Forcing the handle against a warped door strips the internal zinc gears inside the central lock box. Executing a permanent uPVC door bowing in sun fix requires ripping out the flimsy hollow leaf and hanging a fully steel-reinforced trade unit.
Trade Counter Upgrades
Ditch the flimsy, unreinforced internet doors before the lock jams completely.
Walk down to 78 Alma Road to see the heavy galvanized steel profiles inside our trade-grade doors. Our counter team can supply a structurally solid door built to stay dead straight through the hottest summers. Call the trade desk on 01202 533126 for a direct price.
