Griffin Mill dates its founding to 1600 and Ham Mill made textiles from 1601 until 2000, so the valley has a long run of working buildings. Many have since been converted, divided into units or kept for storage and light industry. Whatever the use today, the roof is usually bigger and lower-pitched than a house roof, and it fails in different places.
Q2.1Where does water get in on a wide, shallow roof?
A shallow pitch sheds water slowly, so every joint and upstand is under stress for longer. Where two slopes meet in a valley gutter, the water from both is funnelled towards a single outlet, so that spot is the commonest weak point. Parapet gutters, where the roof meets a wall, and the lead or felt lining them, come next. A rooflight kerb with a cracked seal can drip for years before any stain shows below, and by then the insulation underneath is often soaked.
Q2.2Is a patch ever the right answer on a commercial roof?
Sometimes. A single failed seam or a cracked flashing can be repaired cleanly and the roof left to carry on. Once the covering has worn across a whole area, a patch just shifts the leak elsewhere. The photographs let you see which situation your roof is in. For larger buildings our commercial roofing page explains how repairs, overlays and replacements differ.
Q2.3Can the unit stay open while the roof is repaired?
Usually, if the job is planned around it. Tenants and stock need protecting, deliveries need access, and where water is already coming in we make the area safe before anything else. The order of work is agreed at the survey so that the quote and the programme match, and we sweep up and carry every scrap of waste away at the end.
Industrial roofs also carry plant, walkways and cabling added over the decades. We note each penetration on the survey, since every one is a seam that must keep out the rain.