Module 8: External Finishes Flashcards
External layer of brick
wythe
Not a good insulator
brick masonry wall
Inner frame is load bearing
stone, brick veneer
Stucco
Durable paster (lime, cement, aggregate & water)
Problems w/ installation
Metal and vinyl siding needs ventilation
Requires resealing/grouting
stone finish
Absorb rain water and may deteriorate
clay/cement
Can shrink and crack in the freeze-thaw cycle
Stucco
Stucco is better applied over
masonary walls
Regular maintenance is required
wood siding
Contains weep holes
brick veneer walls
Has different expansion rates leading to cracking
stucco
Out of plumb
not exactly vertical
Horizontal cracks can lead to
water penetration and insect infestation
ceiling joists are attached to roof rafters
prevent spreading
R-value
resistance to heat flowing through a given thickness of material
higher the r-value…
the better of an insulator the material is
Main floor areas rvalue
r12 to r26
Open-cell spray foam
lower insulation density (used in interior walls)
Closed-cell spray foam
higher insulation density, moisture proof (used on exterior walls)
Recommended r value of attics
r38
Most commonly used insulation
glass fiber
Adds insulation around irregular shaped areas
cellulose fibre