WINDOW CONDENSATION

Condensation occurs when warm, moisture-laden (humid) air comes into contact with a colder surface such as, single pane glass.

Windows don’t create condensation.

This results in increased heating costs as additional energy is required to convert condensation back into vapour which is taken up by the air as the temperature rises.

In New Zealand dwellings, the average houses RH (relative humidity) ranges from 30% to 65% during the day-time in a dry house, and 50% to 75% in a damp house. Cold bedrooms can have relative humidities of 80% - 90% at night-time. For optimum occupant comfort, relative humidity of 40–60% is recommended.

Data from BRANZ research shows that houses heated to a constant 18˚C experience far fewer periods of high humidity and condensation on their windows.

Condensation is controlled in two ways: first, by reducing humidity so that air is less likely to become saturated; second, by reducing the likelihood of warm air coming into contact with cold surfaces.

This can be achieved through insulation by changing from single glazed windows to double glazing and raising indoor temperatures.

Double glazing works to form a thermal barrier to the outside, making the inner side of the double glazing warmer, which helps prevent internal condensation. High-performing Low E double glazing will significantly reduce the likelihood of internal condensation.

ABOUT LOW-E GLASS

Low Emissivity (LOW-E) coated double glazing improves the thermal insulation of your windows and ultimately reduces heat loss in your home. When looking out through Low E (low emissivity) glass the virtually invisible high-tech coating lets light into your home, while reflecting heat.

Low E glass also works to keep the heat in during winter, reducing the chance of condensation. In particular during winter, Low E glass reflects heat back into the room, so less heat is lost through the windows. In summer, the sun’s heat is reflected back outside

The protective, high-tech coating on Low E glass effectively forms a barrier, reflecting heat back from the glass to reduce heat loss, while at the same time reducing solar gain.

The Thermawood Double Glazing System meets the requirements of the IGUMA and will satisfy IGUMA member’s warranties.

Technical Notes:

  • 18mm Insulating Glass Units can be glazed into 42mm timber section.

  • Much cleaner internal and external sightlines due to the purposely designed self-adhesive wedge.

  • Drainage system and back pressure work together to minimize water ingress and drain out moisture resulting in longevity of timber and Insulating Glass Units.

  • Unique co-extruded sill adapter provides platform for drainage, setting block, bottom bead location and support while santoprene backing fin prevents water ingress.

  • 15 degree sloped and slotted IGU compatible silicone glazing blocks securely lock into sill adapter.
    Suitable for both factory and site glazing.

  • Significant reduction in glazing time over traditional timber glazing techniques.

  • Eliminates the need for wet glazing compounds, tapes and silicones.

  • Frames can be transported as soon as glazed – no curing times.

  • Tested to NZS4211:2008 Extra high Wind Zone water penetration test requirement.

  • Sloped drainage system for new timber joinery

  • Dry glazing system

  • Designed to suit 18mm double glazed units

  • Self adhesive tape

  • Complete glazing system, including rubber seals, sloped glazing blocks, drainage adapter and beading

THERMAWOOD SYSTEM IN DETAIL

System Components

  1. 41 - 44mm Timber Section

  2. C1 Stainless Steel Brad (25mm)

  3. Top Slotted Timber Bead Pre Primed or Natural Cedar

  4. Slotted Wedge Eliminates wet glazing compounds, tapes and silicones

  5. Bottom Slotted Timber Bead Pre Primed or Natural Cedar

  6. C1 Stainless Steel Brad (50mm)

  7. Insulated Glass Units
    18mm Glazed into 41-44mm timber section

  8. Two Piece Heel & Toe Block For easy heeling and toeing (see below).

  9. Self Adhesive Wedge Eliminates wet glazing compounds, tapes and silicones.

  10. Bottom Drainage Adaptor This unique adapter provides a platform for drainage, setting block, bottom bead location and support while a Santoprene backing fin prevents water ingress.

  11. Slotted Silicone Block 15 degree sloped and slotted IGU compatible silicone glazing blocks securely lock into drainage adapter.