Page 40 - 2014 SDCA Project

BUILDING SYSTEMS PROPOSAL

JOLLY AVENUE DEVELOPMENT CENTER

PRELIMINARY ENVELOPE DESIGN

During the preliminary design phase of the Jolly Avenue development Center (JADC), several envelope options were developed for possible use in the project. The basic
building “envelope” consists of the floor/slab, wall and roof assemblies, which can be represented in a “wall section” as illustrated in the accompanying documents. The final
envelope design must of course respond to the general requirements of being aesthetically pleasing, cost effective and durable in the context of the specific application and

environment in which it will be used. Additionally, in order to meet the stringent Passive House performance criteria, the envelope must address a number of considerations,
some of which are listed as follows:

1. Adequate and continuous insulation to control heat loss/gain (like your nice wool coat for a cold day).
2. A continuous barrier to control air infiltration (like your wind breaker for that gusty day).

3. Proper detailing to eliminate “thermal bridges” through the envelope (imagine that hot skillet handle without a pot holder).
4. Proper material selection to help control the unwanted effects of moisture/water within the building assembly (like cotton socks vs. acrylic on a hot summer day).

5. The proper assembly of the various materials and components into floor, wall and roof systems so the whole building performs as intended (wearing your wind breaker
inside of your nice wool coat is not the best idea).

The two “preliminary” wall sections (labeled Option 1 and Option 2) shown on page generally respond to above considerations although verification that they quantifiably
satisfy the specific Passive House performance requirements will necessarily occur later in the process after the project design and its associated details are more further

developed.

As a starting point, the amount of insulation to be used in the envelope (as reflected in the R-values for the assemblies) was based on a Passive House project designed

elsewhere in a similar climate zone. The accompanying document titled “R-Values of Envelope Assemblies” indicates the components the preliminary floor, wall and rood
assemblies and calculates their associated R-values; this document is part of the Passive House Planning Package (PHPP), which is used for energy modeling of projects seeking

Passive House certification. Both of the wall section options should be developable into systems that meet Passive House requirements. For preliminary planning purposes, the
team is currently proceeding on the assumption that option 1 will be used although option 2 may be considered later, subject to additional information relative to the
constructability, cost and environmental impact issues associated with each option.

Later in the design process the wall sections will be further developed in concert with larger scale details showing the additional critical components (sealant joints, flashings,

and etc.) necessary for a high performance building system; one that we also expect to be the “best dressed” building in the neighborhood.

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