Energy performance data for select combinations of options is available in table format on each product page.
U value required for sliding doors.
Nfrc u factor ratings however represent the entire window performance including frame and spacer material.
Doors are a little different.
Although opaque doors are included in the definition of fenestration area in the 2018 iecc and 2018 irc they are assigned a maximum u factor of 0 35 separate from the u factor requirements for vertical fenestration.
U factor is the rate at which a window door or skylight conducts non solar heat flow.
For windows skylights and glass doors a u factor may refer to just the glass or glazing alone.
Many doors don t have any glass like your front door but even doors with lots of glass like a sliding patio door have lower glass to frame ratios than windows or skylights.
The energy star most efficient 2020 designation recognizes the most efficient products among those that qualify for the energy star program.
U value of 1 6 w m k or less for the window.
Typical u values on windows and window energy ratings on pvcu and aluminium windows and doors.
This means doors can provide more insulation than a window or skylight can.
This tool provides some of the most common options on windows and doors and related nfrc certified values.
To access those tables select the individual product of interest and scroll down to the professional resources section.
It s usually expressed in units of btu hr ft2 of.
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.
As a guide try to look for the following as minimum criteria.
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.
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.
Energy star most efficient 2020 sliding glass patio doors.
Origin aluminium bifolding doors.
The u value is a measure of heat transfer across a building material.
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.
Glass or patio doors especially sliding glass doors lose much more heat than other types of doors because glass is a very poor insulator.
These sliding glass patio doors represent the leading edge in energy efficient products this year.
Put simply the lower the u value the less energy is required to make conditions comfortable inside.
This u value should not be exceeded.