These sliding glass patio doors represent the leading edge in energy efficient products this year.
U value required for sliding doors.
U factor is the rate at which a window door or skylight conducts non solar heat flow.
To access those tables select the individual product of interest and scroll down to the professional resources section.
For example a 1 1 2 inch 3 81 cm thick door without a window offers more than five times the insulating value of a solid wood door of the same size.
As a guide try to look for the following as minimum criteria.
Nfrc u factor ratings however represent the entire window performance including frame and spacer material.
Energy performance data for select combinations of options is available in table format on each product page.
For information on the maximum u value allowed please refer.
It s usually expressed in units of btu hr ft2 of.
Sealed units with a u value which is better than1 2 w m k.
If you are to install windows and doors you should be aware that they need to comply with the requirements of the building regulations in relation to the amount of heat that can pass through the glass and framework which is measured as a u value.
This means doors can provide more insulation than a window or skylight can.
At least a window energy rating wer of c.
It is typically used as a measure of heat loss from inside your home to the outside and could be a measure of thermal performance for your walls roof and floors as well as your aluminium windows and doors.
Doors are a little different.
Glass or patio doors especially sliding glass doors lose much more heat than other types of doors because glass is a very poor insulator.
This tool provides some of the most common options on windows and doors and related nfrc certified values.
This u value should not be exceeded.
U value of 1 6 w m k or less for the window.
For windows skylights and glass doors a u factor may refer to just the glass or glazing alone.
The u value is a measure of heat transfer across a building material.
Typical u values on windows and window energy ratings on pvcu and aluminium windows and doors.
Put simply the lower the u value the less energy is required to make conditions comfortable inside.
Energy star most efficient 2020 sliding glass patio doors.
As standard our entire range of hinged sliding or folding doors come toughened pilkington k s glass including soft coat low e coating warm edge spacer bars and argon gas fill.
The energy star most efficient 2020 designation recognizes the most efficient products among those that qualify for the energy star program.