Arch 173: Building Construction 2THE THIRD SKIN

Arch 173: Building Construction 2THE THIRD SKIN

The Building Envelope –where Building Construction meets

Environmental Design

The First Skin

The First Skin

The Second Skin

The Third Skin

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The Third Skin

The building envelope, aka third skin, must mediate between the environment and our second skin to make us comfortable.

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THIRD SKIN!

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The Third Skin is composed of:

#1 – opaque elements

#2 – transparent elements

#3 – the details that join them

The Third Skin is supposed to:

#1 – Manage climate (heat, cold, sun, light, breezes)

#2 – Be durable

#3 – Look good!

Heat Transfer Mechanisms

Image courtesy of Collette/Baker-Laporte

©IBE 213 All Rights Reserved IBE, Baker-Laporte, Collette

Insulation & Thermal Conductivity

14©IBE 213 All Rights Reserved IBE, Baker-Laporte, Collette

15©IBE 213 All Rights Reserved IBE, Baker-Laporte, Collette

Insulation & Thermal Conductivity

16©IBE 213 All Rights Reserved IBE, Baker-Laporte, Collette

Insulation & Thermal Conductivity

The BIG Wall Section from Arch 172

The BIG Wall Section from Arch 172

Lintels are ALWAYS vertical above openings!

Wood has no strength against deflection when laid flat.

Impact of insulation choice in roofs:

Fiberglass batt, cellulose can get wet so must always be vented

Rigid polystyrene cannot get wet so can be sandwiched without venting

Sprayfoam insulation does not need venting.