08/28/2025
This is a technical architectural diagram showing a cutaway view of the exterior wall and roof eave of a house. The drawing labels the various components of the wall assembly and the roof structure, providing a clear illustration of how they fit together.
Here is a detailed breakdown of the labeled components:
Wall Structure (from inside out):
* insulation cavity: The space between the wall studs where insulation is placed.
* exterior sheathing: The structural paneling (e.g., plywood or OSB) that covers the exterior of the wall frame.
* house wrap: A waterproof, vapor-permeable membrane installed over the sheathing to protect the house from moisture.
* furring strips: Thin strips of wood or metal attached to the exterior of the house wrap. They create a small air space for drainage and ventilation behind the siding.
* horizontal lap siding: The final exterior cladding of the wall. In this case, it's a type of siding with overlapping horizontal boards.
* exposure: The visible portion of each piece of siding.
* watertable: A horizontal molding or trim piece at the bottom of the siding, designed to shed water away from the foundation.
* drip cap: A horizontal piece of flashing that directs water away from the top of the watertable or other horizontal trim.
* foundation wall: The concrete or masonry structure that supports the house.
* sill plate: The bottom horizontal member of a wall frame, resting on the foundation.
* floor joists: The main horizontal structural members that support the floor.
Roof and Eave Structure:
* gutter: The channel along the edge of the roof that collects and diverts rainwater.
* fascia: The vertical board that is fastened to the ends of the rafters, creating a finished look for the eave.
* soffit: The finished material on the underside of the roof overhang (the eave).
* frieze board: A horizontal board that is typically used as a decorative trim where the siding meets the soffit.
The numbers 1, 2, and 3 are likely reference points for a more detailed instruction or a building code diagram. The diagram is an excellent visual aid for understanding the components of a well-built exterior wall and roof, with a focus on proper layering for weather resistance.