dorchesterglassandglazing.co.ukDorchester Glass & Glazing Company

Dorchester How To Measure A Double Glazed Unit

How to measure a double glazed Window

           HTMG     

Most double glazed sealed units in PVCu frames are either 24mm or 28mm thick and wooden frames can be any thickness from 14mm upto 28mm thick. You should be able to check with your supplier for these dimensions. If you purchased the windows/doors a long time ago the information should be on your receipt or warranty.

If you do not have this information to hand then you will have to calculate the measurement yourself. This is tricky but it can be done and you will need a tape measure and a straight edge such as a piece of wood.

Firstly measure how thick the PVCu frame/opener is and then place a straight edge against one side of the frame and let it protrude into the area of the glass (as the picture above).

As the straight edge will be flat against the PVCu, it should be floating away from the glass. Measure the gap (A to B) from the glass to the inside of the straight edge and write this down. Do the same with the other side of the frame and note the measurement again.

To calculate the thickness of your double glazed sealed unit you would need to deduct these 2 measurements from the thickness of the PVCu frame and you should have a measurement of either 24mm or 28mm.

As an example, the frame that holds the glass is 62mm thick, the A to B gap (as the photo above) of one side is 17mm and the A to B gap of the other side is also 17mm. This gives us a measurement to deduct of 34mm. 34mm deducted from the frame thickness of 62mm is 28mm and this figure is the thickness of the sealed unit in this frame.

Emergency Double Glazed Safety Glass

Disclaimer
The tips and advice on this page are just a helpful insight into measuring and installing of glass panels. dorchesterglassandglazing.co.uk does not accept any responsibility if you are injured or suffer loss - financial or otherwise by following our tips and advice from this page. These tasks should only be undertaken by a competent person that is skilled in DIY and should not be attempted by DIY novices.

If you are not a competent person in DIY we advise that you hire a tradesman to undertake your glass measuring and installations. dorchesterglassandglazing.co.uk do not accept responsibility for the incorrect measuring of your glass. The only guaranteed way to get accurate glass sizes is to obtain the sizes from the window/door manufacturer at time of purchase.

24 hr boarding service

24 hr boarding service

We provide a professional 24-hour boarding service throughout Dorchester and the surrounding areas, ensuring our vans are always stocked to secure your property promptly. As Dorchester glaziers, we understand the urgency and offer boarding as a temporary measure before glass replacement.

See more
Shop front Replacement

Shop front Replacement

COMMON SHOP FRONT GLASS PROBLEMS WE CAN REPAIR:

Your shop front is the face of your business, so when your glass is damaged, it’s essential to replace it as quickly as possible! The most common call-outs we get are for:

• Burglary or break-in damage
• Vandalism repairs
• Condensation in the glass
• Scratched, cracked or shattered glass
• Misty glass in-between panes
• General wear & tear

Shop Front Glass

Frequently asked questions

Laminated glass products make float glass suitable for today's demanding architectural applications such as: noise reduction, hurricane impact-resistance, blast mitigation, forced entry, protection from broken glass – or a combination of these.

These glass sheets are held together permanently by an interlayer such as polyvinyl butyral (PVB). Laminated glass is about two times stronger than standard float glass of the same thickness, with the advantage that in case of breakage, it generally holds together by breaking into a spider-web pattern.

Float glass: This is the most budget-friendly and has no natural tint. It is a single piece of glass that breaks into sharp shards when hit with force. Float glass can, however, undergo a lot of chemical processes to be strengthened. It can be used in single-pane and even double-pane windows once it's been enhanced.

This type of glass adds additional strength to your windows. To gain entry, a burglar would have to strike the glass repeatedly in the same spot in order to make a small opening. Most burglars are reluctant to create this type of noise for fear of being detected.

Look closely at the glass edge: tempered glass will have a smooth, slightly rounded edge without sharp corners. Untempered glass has a sharp, unfinished edge. You may also notice small nicks or divots in the glass edge. Tempered glass has undergone intense heating and rapid cooling, so its surface is more durable.

Annealed Glass      Less expensive, Good visibility
Laminated Glass    Strong material, shatter-resistant glass
Low-E Glass          Energy-efficient, thermal coating that lasts 10 to 15 years
Tinted Glass          Promotes greater privacy, heat transfer resistant

As the most common type of affordable glass, float glass will often be used for low-cost windows and smaller display cabinet-style doors, as well as being the base material for almost every other application.

Toughened is around 5 times stronger than laminated. It, therefore, needs to be hit a lot harder for the glass to break. When toughened is hit with enough force, it will break up into lots of small, blunt pieces rather than long sharp shards.

Areas we cover

1 hour service   24 hr boarding service   Cat & dog flaps fitted   Cat flaps   DGU   Double glazed units   Emergency glass repair   Emergency Glaziers   Emergency glazing   Get in touch   Glass cut to size   Glass manifestation   Glass samples   Glazing home   Greenhouse Glass   How To Measure A Double Glazed Unit   Jobs   Laminated safety glass   Mirror glass   Quote   Replacement window glass   Schools   Services   Shop front   Shower screen   Table tops   Toughened safety glass   What glass should I Have
Services   Emergency Glazier   Glass   Fire Rated Glass   Emergency glaziers near me   Emergency Boarding   Emergency Glass   Double Glazed Units   Glaziers   Glaziers Near Me   Glazier   Commercial Glaziers   Shop Fronts   Window Repair   Safety Glass   Misted Double Glazing   Misted Double Glazed Units   window glass   Cat Flaps   Broken Glass   Mirrors   Shopfront Glass   Boarding Up
Postcodes   DT11   DT5   DT2   DT7   DT1   DT6   DT4   DT10   DT9   DT8   DT3
Towns   Cashmoor   Osmington Mills   Southwell   Lillington   Manston   Hilton   Higher Whatcombe   Chickerell   Broadoak   Burton Bradstock   Hooke   Mosterton   Farnham   Broadmayne   Blandford Camp   Lydlinch   Blandford Forum   Bothenhampton   Broadwey   Alton Pancras   Ibberton   Buckland Newton   Charmouth   Burton   Marshalsea   Sutton Poyntz   Chalmington   Dorchester   Cheselbourne   Batcombe   Eype   Dottery   Blandford St Mary   Loders   Bradford Peverell   Upwey   Blackdown   Almer   Burleston   Chettle   Radipole   Caundle Marsh   Bradpole   Stalbridge   Fishpond Bottom   Milborne Port   Chaldon Herring   Iwerne Courtney or Shroton   Holwell   Langton Long Blandford   Lyme Regis   Milborne St Andrew   Seaborough   Benville Lane   Westham   Bridport   Fifehead Neville   Abbotsbury   Chideock   Rousdon   Bincombe   Netherbury   Iwerne Minster   Bingham's Melcombe   Bettiscombe   Broadwindsor   Askerswell   Melplash   Bishop's Caundle   Sturminster Common   Cerne Abbas   Corton Denham   Leigh   Portesham   Drimpton   Bradford Abbas   Longburton   Stoke Abbott   Preston   Morcombelake   Uplyme   Allweston   Easton   Hinton St Mary   Beaminster   Nettlecombe   Hammoon   Marnhull   Haydon   Dowlands   Mapperton   Chetnole   Beer Hackett   Charlestown   Affpuddle   Burstock   Chilfrome   Melcombe Regis   Sturminster Newton   Wyke Regis   Toller Whelme   Birdsmoor Gate   Bryanston   Crouch Hill   Overcombe   Charminster   Glanvilles Wootton   South Perrott   Milton Abbas   Grove   Briantspuddle   Goathill   Durweston   Anderson   Cattistock   Whetley Cross   Adber   Osmington   Stalbridge Weston   Kingston   Rodden   Middlemarsh   Charlton Marshall   Todber   Weymouth   Holnest   Compton Valence   Hazelbury Bryan   Chilcombe   Pinhay   Fortuneswell   Weston   Chedington   Charlton Horethorne   Child Okeford   Mappowder   King's Stag   Folke   Weymouth   Marshwood   Stourton Caundle   Langton Herring
Counties   Dorset   Devon   Somerset
© 2026 dorchesterglassandglazing.co.uk
Chat on WhatsApp