On window labels, there are 5 basic pieces of information that are very important:
U-factor measures how well a window prevents heat transfer. The lower the U-factor, the better a window’s resistance to heat flow. It also means it has a better insulating value. A window with a U-factor of 0.25 has an R-value of 4 (1/.25=4).
Solar Heat Gain Coefficient (SHGC) determines how well a window blocks heat from sunlight. SHGC is measured from 0 to 1 and it’s the fraction of incident solar radiation through a window. The lower the number, the less solar heat transmits into the home.
Visible Transmittance (VT) is how much light comes through a window or skylight. It’s also measured between 0 and 1. The lower the number means the lesser amount of visible light shines through. If a window has a VT of 0.85, that means that 85% of the light will transmit through the window.
Air Leakage (AL) measures air infiltration through cracks in the frame, sash, and the window as a whole. The rating is shown as equivalent cubic feet of air that passes through a square foot of window. The lower the number, the lower amount of air that passes through.
Condensation Resistance (CR) is the ability of the window to resist the formation of condensation on the inside of the window during colder weather. CR is measured between 0 and 100 with the higher rating indicating that it’s better at resisting condensation forming on the interior of the window.
Surprise. Ron has the plumber and the electrician in the house at the same time.
Art and the team from Custom Pluming continue to jackhammer away at the foundation and install PVC pipes. That’s Art in the photo above, leveling the PVC pipe for the drains in the mudroom
While the plumbers are deep in the trenches cut by jackhammers … Sean and his team of electricians are on site, two days early, installing ceiling cans, nailing up blue electrical outlet boxes at proposed locations.
Ron pulled Steve into the kitchen to talk about the ceiling cans over the aisles. There’s a triple-beam almost precisely where the plans call to install three 6-inch LEDs. With help from Sean, we measured it out with two tape measures — the cabinets extend 24 inches from the wall, the aisle runs next to the cabinets, the center of the aisle is just about directly under one of the three beams in the triple beam … but if we turn the cans 90 degrees and slide them all the way over, Sean is able to install the cans over the aisle, one inch closer to the cabinets, putting the light beams from the can overhead and closer to the cooktop and sink, providing more light. And all this aligns with the ceiling cans that will be installed in the adjoining pantry and mudroom, establishing a straight line of overhead lights.
And then we turned 90 degrees to compute the center of the cooktop, extending that line into the center of the island.
The only addition to the house takes place at the front entry, dictated by the need to rebuild the stairs to code. See Stairs, cascading.
Here are the new exterior walls, erected by the framers, yesterday and today. The front door is turned 90 degrees, away from the street. There will be more windows cut into the OSB sheathing, to spill more light into what was a dark hallway.