Frequently Asked Questions
Pragmatic answers for architects, builders, and DIY renovators regarding material performance and structural sustainability.
Is mass timber safe against fire?
Yes. Heavy timber constructs are remarkably safe in a fire due to charring. The outside of the beam burns and turns to char, which naturally insulates the core, preserving its structural integrity far longer than unprotected steel frames, which can warp under intense heat.
What does "embodied carbon" mean?
Embodied carbon refers to the greenhouse gas emissions arising from the manufacturing, transportation, installation, maintenance, and disposal of building materials. It is distinct from operational carbon, which comes from heating, cooling, and powering the building.
What is an R-value?
An R-value is a measure of thermal resistance used in the building and construction industry. Specifically, thermal resistance is the temperature difference, at a steady state, between two defined surfaces of a material or construction that induces a unit heat flow rate through a unit area. A higher R-value means better insulation.
How does a rainscreen differ from traditional siding?
Traditional siding is installed directly against the weather barrier and sheathing. A rainscreen includes a physical air gap between the cladding and the structural wall. This gap allows for drainage of bulk water and creates an updraft of air to dry out the cavity, severely reducing the risk of rot and mold.
Can hempcrete be used structurally?
No. Hempcrete is non-structural. It must be cast around a load-bearing frame made of timber, steel, or concrete. Its primary purposes are thermal insulation, acoustic dampening, and moisture regulation.
What is the lifespan of Corten weathering steel?
When used in appropriate climates (avoiding high-salt coastal environments or areas with constant standing water), Corten steel can last well over 50 to 100 years. The protective patina continuously regenerates when exposed to alternating wet and dry weather.
Why use fly ash in concrete?
Fly ash is a byproduct of coal combustion. Adding it to a concrete mix replaces a portion of the energy-intensive Portland cement. This lowers the embodied carbon of the concrete, makes it more workable before setting, and can improve long-term strength and durability.
What is thermal bridging?
Thermal bridging occurs when a highly conductive material (like a steel beam) passes through the insulation layer of a building envelope. It acts as a direct path for heat transfer, significantly degrading the overall thermal performance of the wall or roof.