Misting or fogging in double-glazed windows is quite common in older homes where the guarantee has expired. Owners often put up this, because it is a cosmetic problem that they feel is not worth the money to repair. As a London Window Fitting Expert I’m often asked what causes this irritating problem, and I thought others might like to know why too.
- Some condensation is natural in the space between two glass panes, because of the difference between outdoor and indoor temperatures. In earlier days this drained naturally away. These days another plan is put in place in the interests of thermal efficiency.
- The moisture-absorption material used instead is known an silica – that’s the same stuff as the tiny white balls found in little bags and shipped with electronic goods.
- This silica is in the separation bars that keep the double-glazing panes apart. You’ll find them right up against the inner window frame. The idea is that the silica absorbs the moisture in winter months, and dries out again in summer.
- Unfortunately, this is not always the case, and sometimes the silica becomes water-logged in less than five years. Most double-glazing is guaranteed for ten years though. If you are lucky enough to have the original warranty then you may have a claim.
If you are unable to prove the claim and want your unsightly problem solved, then I suggest you Find a Window Fitter to do this for you. Many people prefer to have a drain hole inserted instead, because this is half the price of a complete Replacement Window Fitting Quote.
The window fitter who contributed this advice is listed on Mr-Skill. Like our other skilled artisans in all UK trades, he has a reputation that goes back for years, and he is registered as required by law too. Please contact us in the event that you require Professional Window Fitting Quotes.