Solar heat gain coefficient shgc a measure of how well a glazed door assembly absorbs or reflects heat from the sun.

U factor and shgc standard french doors. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. A lower u value is considered better i e. The lower the coefficient the better the glazed door is at blocking the sun s heat. U factors on windows generally range from 0 25 to 1 25.

It s usually expressed in units of btu hr ft2 of. U factor is the rate at which a window door or skylight conducts non solar heat flow. Bi part 168 x 92 or single slide 96 x 92 no transom 1 glass 10 bottom rail 2 muntin narrow stiles. Solar heat gain coefficient shgc.

Center of glass shgc before door frame 0 30 0 45 0 21 0 31 0 45 0 57. Solar heat gain coefficient shgc shgc measures the amount of solar radiation transmitted through a window expressed as a number between 0 and 1. U factor shgc solar heat gain coefficient product type any awning casement double hung fixed casement french door horizontal slider picture window side lite transom single hung sliding glass door storefront door storefront window. Nfrc u factor ratings however represent the entire window performance including frame and spacer material.

In addition to u factor shgc and vt simpson doors have been tested for air leakage a more recent requirement for some states and municipalities. Please note that some designs may have different values based on the components and or glass type specified for the door. Glazed doors in hot or temperate climates should have a low shgc. By architectural windows doors.

2 solar heat gain coefficient shgc defines the fraction of solar radiation admitted through the glass both directly transmitted and absorbed and subsequently released inward. The window u rating is reflected as a number between 0 20 and 1 20. U value shgc explained. The aluminium frame including glass with a low u value has a higher resistance to heat flow and has a higher insulating value.

The lower the u value means the glass will transfer less heat meaning your home will be better insulated. 0 2 0 4 0 5 0 3 0 1 0 6 0. Center of glass shgc before door frame 0 05 0 025. Posted november 01 2015.

It does not factor in solar heat from direct sunlight. The u value measures how well a product prevents heat conducting through the whole window frame and glass. 0 06 0 18 recommend. When selecting aluminium windows and aluminium doors for your home or building project you will often be required to comply with certain performance values for energy efficiency.

All simpson doors have met the air leakage 0 3 requirement.

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