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Home Lighting Design – Daylighting Design
This article develops a unique and comprehensive Daylighting Design Schedule home lighting design to address code and more. Domestic lighting design policy for most homes these days: let daylight in with qualifications – maybe not too much, not too little, depends on location, depends on how, when, depends what it shines on, etc. a daylighting design program.
Domestic Lighting Design Code: IRC 303.1 effectively and indirectly presents that for daylighting design, at least in a bedroom, the “total glazed area” shall not be less than 8% of the floor area of this room. (CABO is harder, fewer exceptions.) [Please note that this presentation has no direct connection with emergency egress.]
Practical natural lighting design at home? Who knows. The author has had reactions ranging from “exactly, just” to “not so important here” to “what are you talking about” from the relevant building authorities. If considered by others it would only be for the sleeping areas which is what I expect.
AGGREGATE GLAZING AREA
To begin with, the term aggregate glazing area – otherwise undefined – is interpreted to mean a translucent surface – glass, transparent plastic, etc. and not a frame, sash, intermediate uprights, trim, etc. associates. What Marvin Windows and Doors defines as “Lite”, Pella as “Visible Glass”, Loewen as “Exposed Glass Area”, etc.
Please note that if some people weren’t interested in these surfaces, the big Windows players wouldn’t make it in print. This custom home designer is interested.
THE HOME DAYLIGHT PROGRAM FOR DAYLIGHT DESIGN
A daylighting program or lighting program for home lighting achieves four goals.
First, it defines the proportion of total glazed area to interior area in each main space of a residence, including habitable rooms, halls, dressing rooms, utility spaces for workshop and laundry and others , the garage(s), etc.
Second, it compares the actual aggregated glazing area to the calculated code target for each major space and presents the difference either in square feet of glazing area or, increasingly likely, as a percentage of the glazing area target – the latter seems easier to understand usefully.
Third, it selectively comments by suggestion, indication and definition on the aspects of daylighting significance as warranted by designers’ opinions.
Fourth, it provides the ability to identify consistently dark spaces or portions of spaces far enough from a natural light source to be considered unlit or unpenetrated by a natural light source, for example, a space considerably away from the daylight of a covered porch, an exceptionally deep interior space.
The BOM structure is in the form of a table with several columns. From the left, let’s see: a give space; its area in square feet; 8% of this area in square feet; total glazing area of that space in square feet (usually to one decimal); the arithmetic and percentage difference between the 8% and the overall glazing column; and comments, if any. Comments may include, but are not limited to, modulate, darken, up-to-code (for sleeping areas), etc.
Home lighting experts set definable limits on the extent of useful natural light that can enter a space. These limits can be found, for example, in Lighting Design Basics by Mark Karlen and James Benya, John Wiley & Sons, Inc., 2004, p.34 and Interior Lighting For Designers 4th Edition by Gary Gordon, John Wiley & Sons, Inc. . ., 1957, p.53ff. While this daylight penetration aspect of daylight analysis can be critical, consideration of the related adjustment to daylighting is, according to the author, worth the effort as that preventative design alert for convenience and safety.
The Home Daylighting Design Program presents several bases or inputs for home design analysis – 16 in all.
1. Of itself for the natural light, in the orientation of the compass of the house and, possibly, its adjustment and in the personal evaluation of the infiltration and the adequacy in the spaces lit by the light of the day.
2. Ventilation as a quality control cross-check in cross ventilation of sleeping areas and longer occupied rooms, as well as sizing and indicative location of supplies and returns.
3. UV intrusion indicator indicating where it may be determined to be less welcome and its potency diminished.
4. Natural heat buildup indicator for the attention of HVAC professionals and various design means to reduce.
5. Definition of daylight glare, especially in areas, such as stairs, where glare threatens safety.
6. Qualification for code compliance of the area of glazing aggregated to the surface of the space in sleeping areas, especially more problematic in such spaces in one-and-a-half-storey to L2 structures.
7. Suggestive guide to artificial lighting throughout, especially ambient lighting and lighting controls.
8. Final cross-check of window and door size and location in elevations, plan views and window schedule (and possibly door schedule).
9. Excellent perspective on the consequences of exterior design on interior functionality, sometimes leading to design changes ranging from marginal to major.
10. Increased layering guide in low light spaces.
11. Guide for evaluating continuous service in spaces with little or no light.
12. Window size modification guide.
13. Window location modification guide.
14. Motivation in deep single-story spaces with exterior covers to penetrate these covers with niches in the roof, sunscreen, skylight, clerestory, etc.
15. Motivation in deep single-story spaces with or without exterior covers to add skylights and skylights through skylights and other fenestration design modifications.
16. Motivation, especially in one-and-a-half storey designs, to necessarily add dormers, skylights, skylight tubes, skylights, skylights, and other fenestration design modifications.
Comment: Please note that the last minute correction of major errors to achieve practical and safe sizing and placement of windows, composition of exterior doors, light fixtures and reflective and light absorbing elements light can represent considerable remedial expense and physical inconvenience.
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