Walk-on rooflight installation in Birmingham

A walk-on rooflight is a sheet of structural glass that lets daylight through a surface people stand or move on. In a Birmingham garden that surface is usually a patio, a raised terrace or the paved roof of a rear extension.

The room below gets daylight it would otherwise never see. A cellar under a Victorian terrace, a utility room behind a kitchen or a dark corridor under a decked area can all take a panel.

Whether a position works depends on what sits below and what holds the glass up, which we check at the survey.

What the room below gains

A walk-on panel brings daylight straight down into the room, so the light changes through the day as the sun moves across the sky. Looking up through glass at a terrace, a tree or passing cloud is a feature in itself.

Privacy needs thought. From above, people can see down into a room lit by a walk-on panel, and at night the light inside makes the glass glow. Frosted interlayers and etched finishes soften the view, and we put them on the quote as their own line.

Thermal performance and Part L

Under Part L 2021, new glazing in an existing home is limited in how much heat it may let through. Walk-on glass is treated as a rooflight, so its limit is 2.2 W/m²K. A walk-on unit with a sealed double or triple glazed insulating layer beneath the walking sheet can meet it.

The walking sheet adds thickness but little insulation, so the quality of the sealed unit below it matters most. The maker's figure for the whole assembly appears against each option on your quote, so you can compare them against the limit and against each other.

Where a room below is heated, the glass is part of its envelope. Where it is a cold store or an unheated cellar, the figure still counts, but the effect on your bills is smaller. We say which situation you are in when we write the quote.

Flush set-ups

A flush panel looks the cleanest from the garden, because the glass reads as a window in the floor. Our answer on setting a walk-on rooflight in decking or a terrace explains the support frame, the fall of the surface around it and how water is kept away from the edge.

The detail that matters most is the joint. Water should run across and off the glass, and the paving or decking around it should fall gently away, so nothing collects against the frame.

Raised set-ups

A kerb lifts the panel a little above the surface, which is how most flat roof rooflights are weathered. On a roof that is also a terrace, the kerb can be low enough to step over, and the paving or decking is laid up to it.

Our page on flat roof rooflights sets out how kerbs and upstands work in general. A walk-on kerb follows the same principle with stronger framing.

Plain glass is slippery when wet, like any smooth surface, so a walking panel carries a finish. Fritted glass has a pattern of small ceramic dots fired onto the top sheet. Etched glass has its surface roughened by acid or sandblasting. Both give grip, and both change how the glass looks.

Fritted dots are visible and can be chosen in different sizes. Wider spacing lets in more light and offers less grip, while closer dots do the opposite. Etched glass diffuses light, which also gives a degree of privacy from above.

Our answer on whether walk-on glass is slippery when wet compares the finishes on grip, and we bring samples to the survey where the maker supplies them, so you can wet one and test it with a shoe.

Cleaning and wear

Leaves, moss and dust gather on any outdoor surface, and walk-on glass shows them more than paving does, because you look through it. A rinse with clean water and a soft brush is usually enough. Self-cleaning coatings exist for rooflight glass and help between rinses, though a coating on a walking surface has to be chosen with the grip finish in mind. Ask us about the combination at the survey.

Over time the top sheet picks up fine scratches from grit under shoes. This is normal, and on some walk-on units the top sheet is made to be sacrificial, so a badly marked one can be replaced on its own while the layers below stay in place. Ask the maker for their guidance on which cleaning products suit the finish, and we pass it on with the paperwork.

What holds the glass up

A walk-on panel sits on a frame that spreads its weight into the structure around it. The frame is usually aluminium or stainless steel, with a gasket or bed of sealant between frame and glass. The glass is never allowed to touch hard metal, since point loads are what break glass.

A frame that sits on a built-up kerb, or on a trimmed opening in a timber floor, is only as good as what is under it. We check that the supports are level, sound and dry before we agree a position.

What you see at the edge

Some frames show a narrow metal rim around the glass. Others are almost invisible, with the glass sitting in a recessed channel and a thin sealed joint at the surface.

A narrow visible rim is easier to detail against paving, while a hidden frame looks sleeker and usually costs more. Your quote shows both where both suit the site.

What moves the cost

Walk-on glass costs more than an ordinary rooflight of the same size, because the build-up is thicker and the frame is stronger. Beyond that, the price follows size, load class, grip finish, frame type and the work around the opening.

Our answer on how much a walk-on rooflight costs goes through each of those in turn, and our general page on rooflight costs puts them in context. In the written quote every choice has a line to itself, and each line shows what that choice adds.

Lead times

Walk-on glass is usually made to order, because each panel is cut to the opening. How long you wait is down to who makes the panel, how big it is and which finish is chosen. Standard sizes in common finishes often arrive sooner than larger or custom panels.

For each option the quote carries the range the maker usually works to when it is written, and a fitting date is agreed with you once the glass is confirmed. We keep you in the loop as the panel is made, so you know when to expect it.

What happens on the day

Walk-on glass is heavy, so fitting is a job for a team with the right lifting gear. On a typical day the surround is prepared first, the frame is bedded level, and the glass is lowered into place on suction lifters. Our answer on whether a walk-on rooflight can open covers the units that need a hinge or slide and the extra weight that brings.

Once the glass is in, the surface around it is finished. On a terrace, paving or decking is laid up to the frame and the joint is sealed. On a roof, the covering is dressed up the kerb. In a light well, the drainage is checked and the surround is made good.

The finish inside

Below the glass, the opening is usually lined with a plastered or boarded reveal, or a plain frame in a basement. A deeper reveal frames the view and spreads light; a flat finish suits a thin ceiling. We show you the options at the survey so the finish is not a surprise.

If you plan lighting around the glass or a ceiling treatment, tell us before work starts, so cables go in at the right time.

After it is fitted, and replacing a tired panel

A 10-year workmanship guarantee covers our fitting work, and the panel itself keeps the maker's own warranty. Our page on our guarantee sets out what each covers.

Older walk-on panels in Birmingham may have clouded, scratched or developed a failed seal. A clouded sealed unit under sound glass can often be replaced alone, and our page on misted and failed rooflight replacement explains how we decide. A deeply marked walking sheet can be swapped for a new one where the maker supplies it.

If the panel is in a conservation area or on an older building, our page on conservation rooflights explains how we approach those homes. Where nobody needs to walk on the glass, a roof lantern may sit beside it on the quote.