The short answer
Some mess is unavoidable, because the work involves cutting a roof and a ceiling. But most of it can be kept out of the house, and what does come in can be contained to the room under the opening. With protection laid first, dust managed during the cutting and a proper clean at the end, you should expect to have the room back clean, not lived in around building dust for a week.
Rooflight installation mess is mostly a question of planning. Dust that is expected is dust that has been sheeted off, and the quote should say how it will be handled.
Where the mess comes from
There are three sources, and each is dealt with differently.
- The roof
- Lifting tiles or slates, cutting battens and trimming rafters creates debris and dust above the ceiling. Most of this falls into the roof space, not the room, but a fine dust can find its way through gaps in an old ceiling.
- The ceiling cut
- Opening the ceiling is the dustiest moment. Plasterboard produces a fine pale dust, and old lath and plaster produces a coarser, dirtier one, with soot and old debris from the roof void.
- The finishing
- Plastering is wet work, so it brings splashes and drips rather than dust. Sanding, if a board and tape finish is used, brings dust back again.
How the room is protected
Protection goes down before anything is cut. Floors are covered with sheeting or boards, furniture is moved out or wrapped, and the doorway is sealed or screened where the room opens onto a hall or landing. The cut itself is made with dust extraction attached to the tool, where the work allows, and a sheet is hung beneath the opening to catch what falls.
- Floors and stairs covered along the route in and out.
- Furniture removed or wrapped, with fitted items such as kitchen worktops protected.
- A dust screen across the doorway, so the rest of the house stays clear.
- Extraction at the tool when cutting plaster or board.
- Debris bagged and carried out, not dropped through the house.
In a kitchen or a bedroom, this matters more than anywhere else, as food preparation and bedding are the two things people least want dust on.
Dust and the finish
How a lining is finished changes how much mess it makes. A wet plaster finish creates little dust, but needs drying time. Board and tape produces sanding dust that has to be controlled. Lime plaster is mixed on site and applied in coats, so the mess is wet and contained, though it needs floor protection for longer.
Our written quote sets out how dust will be controlled, next to the room, the ceiling build and the lining. If dust is a particular worry, perhaps because someone has asthma or the room houses a nursery, tell us in the form and we'll put what we can into the plan. Our answer on how long it takes to fit a skylight shows where the finishing days fall.
Old ceilings are dustier
A lath and plaster ceiling releases more dust than modern board, and a roof void that hasn't been opened for decades holds a lot of it. Soot, old insulation, and the fine grit that settles on every rafter all come down when the ceiling is cut. The supported, section-by-section cut described in our answer on fitting a skylight in a lath and plaster ceiling helps, because less plaster is shaken loose and so less is thrown into the air.
Leaving the room clean
At the end of each day, debris is cleared and floors are swept or vacuumed, so you aren't looking at a building site over the following morning's tea. When the work is finished, protection comes up, surfaces are wiped, the floor is cleaned and the glass is cleaned inside and out, so the new rooflight can be seen as it should be. Fine dust can settle for a day or two on high surfaces, so a final wipe over of shelves and window sills is worth doing yourself once everything has settled.
Plastered linings can show a faint tide mark or white bloom as they dry. That is normal and passes once the plaster has fully dried, before it is painted.
Loft rooms and landings
A rooflight over a staircase or landing is its own case, since dust drifts down the stairwell and into every room off it. Here the protection runs up the stairs and across the landing floor, and doors to the rooms off it are shut and sealed with tape. In a converted loft, the opening is often made from inside the room, so the dust is nearer to hand, and the bed and wardrobes need to be out or wrapped before anyone begins.
Flat roofs have an advantage here. The roof stage is largely outside, and the ceiling is cut late in the day, once the new kerb and unit are in place. Less of the house sees any dust at all.
What you can do to help
A little preparation reduces the cleaning afterwards.
- Clear the room as far as you can, especially anything soft such as rugs, bedding and curtains.
- Take pictures and ornaments off nearby walls and shelves.
- Close doors to rooms you aren't using and cover any open storage.
- Make sure the route from the front door to the room is clear, so protection can be laid along it.
It also helps to know the order of work. We set it out in how a rooflight is finished inside, from the cut to the paint line.
To plan your own job, ask for a quote. We'll survey the room, agree how dust will be managed and write it into the finish schedule.