Sealing draughts in public and commercial heritage buildings will return significant savings in heating and cooling costs, as up to 25% of energy is lost via air leakage.

How to improve energy efficiency & reduce noise from heritage windows.

Our draught sealing service is the best and least intrusive way of achieving improved performance from old windows. The seals are machined into the timber components to become an integral, practically invisible part of the window. 

Traditional double-hung sash windows are not regarded as being very energy efficient or quiet.  The sliding sash window frames have inherent gaps that allow the sashes to slide and the timber frames can also warp over time, creating larger gaps where air leakage and air infiltration originate. 

Draught-stripping existing period sash windows can reduce the draughts from them by almost 90%, therefore significantly reducing the air-conditioning or heating requirement needed for the room.  Warm or cold draughts make air cooling and heating systems work harder and make occupants feel uncomfortable, often adjusting room thermostats to compensate.  

Glazing upgrades with modern high performance glass can insulate us from the heat and cold, keep our offices quieter and protect us from intruders.  Specialist window films such as anti-graffiti or explosion protection are also avaliable.

Heat also passes through the glass itself but less than a quarter of the heat transfer through a typical sash window is by conduction, the rest is by air infiltration – draughts.   Heavy curtains or close-fitting roller blinds can help cut the amount of heat transfer through glass by more than 30%. 

“Draught-proofing is one of the most cost effective and least intrusive ways of improving the comfort of occupants and reducing energy used for heating with little or no change to a building’s appearance.” Historic England