Our glaziers provide a 24 hour, 365 days a calendar year glazing and boarding up and producing Harmless service securing doorways and windows to both domestic and professional premises. Boarding Up It needs to be noted, heat losses from hotter objects occurs by three mechanisms (either individually or in combination): https://erickwkpuz.blogocial.com/london-sw3-secondary-glazing-services-for-dummies-62469949