What is a Quality Views Analysis?
Quality Views is a set of standards used to evaluate the effectiveness of a building's design to provide building occupant substantial and beneficial views. cove.tool offers 4 quality view assessments:
- Total Quality Views: Total percentage of floor area that has at least two of the following three kinds of views.
- Type 1 - 90° Sight Lines: Multiple lines of sight to vision glazing in different directions at least 90 degrees apart
- Type 2 - Sky and Context: Views that include at least view to the sky and objects at least 25 feet (7.5 meters) from the exterior of glazing
- Type 3 - Unobstructed View: Unobstructed views located within a distance of three times head height of vision glazing
These analysis types are taken from the LEED v4.0 IEQ c7 Quality Views Credit type 1-3 and a total quality view count. App breakdown below.
Is this analysis LEED Compliant?
To ensure the simulation ran with the cove.tool's Quality Views Analysis meets the credits requirements users must comply with the following guidelines:
- Users must distinguish between regularly occupied floor-area and non-regularly occupied floor-area. That means while uploading geometry to cove.tool, regularly occupied floor area is brought into cove.tool through the Floor Category export, and non-regularly occupied floor area is brought in through the Shading Device Category. Only floor area imported through the floor category will contribute directly to the final %Views assessment.
- Achieve a direct line of sight to the outdoors via vision glazing for 75% of all regularly occupied floor area.
- View glazing in the contributing area must provide a clear image of the exterior, not obstructed by frits, fibers, patterned glazing, or added tints that distort color balance.
- Any permanent interior obstructions must be included as shading devices or interior walls to be include in the final calculations
- May exclude movable furniture and partitions.
- Additionally, 75% of all regularly occupied floor area must have at least two of the three available Views Types in cove.tool
Meeting these requirements, users will sufficiently have set up an accurate simulation to generate the results needed to complete the credit documentation. More on documentation in the next section.
Does this analysis generate LEED documentation?
Not directly, it provides the information needed to complete the documentation process, but not the final deliverable form. Below is an example of the type of form that would need to be completed in order to submit to LEED. The cove.tool analysis provides information for column 1 (in Levels), 2 (Level #), 5 & 6. Users can collect Total Floor Area (column 3) for each level from their model for, and (column 4) Floor area with direct line of sight to outdoors via vision glazing. Download latest calculator from USGBC here.
Taken from "LEED v4.0 - IEQ c7 Quality Views" Credit, the Quality Views Assessment is a grid-based analysis. First, each floor of the analyzed building is divided into 1-foot x 1-foot grid cells. Then, from the center of each grid cell, the presence of obstructions is checked in all directions, namely, walls, windows, and furniture. If a window is present without a obstruction, the distance from the grid center to the obstruction is determined, and this information is used in calculating the different LEED Views Scores for that grid cell. There are three different scores calculated to determine four different view types for each grid cell:
- Sight Lines: If there are two windows present in the line of sight from the center of this grid cell in any two directions, such that the directions are at least 90 degrees apart, a positive ‘Type 1’ score is assigned to this grid cell.
- Sky and Context: If there is a window present in the line of sight from the center of this grid cell this analysis check two line of sights through the window. In the horizontal light of sight if no context building or building element exist at least within 25 ft beyond the window, this analysis is partially satisfied.
The second part of this analysis check along an oblique line of sight from grid cell center when looking towards the top of the window. If there is no context building or building element exist at least within 25 ft beyond the window, this analysis is completely satisfied and a positive ‘Type 2’ score is assigned to this grid cell. This analysis can be visualized in the GIF below.
- Unobstructed View: If from the grid center there is a window in direct line of sight within the distance that is at most three times the maximum height of the window itself from the floor, the grid cell is assigned a ‘Type 3’ positive score.
- Total Quality Views: If at least two of the above conditions are satisfied then the grid cell is assigned a positive ‘Merged Views’ Score.
For each type of the above analysis, the LEED Views ‘Type’ Scores for the individual grid cells comprising a floor are averaged, providing the LEED Views ‘Type’ Score for that floor (LEED Views ‘Type’-floor= average of LEED Views ‘Type’-grids). The LEED
Views ‘Type’ Scores for all the floors are then averaged to provide an overall LEED Views ‘Type’ Score for the building (LEED Views ‘Type’ -building = average of LEED Views ‘Type’ -floors).
The buildings complete LEED Views Quality is given by the Merged Views Score. If the Merged LEED Views Score of the building is above 75% the building is considered to have good Quality Views. The underlying method considers line of sight to be ray parallel to the floor at a height 4.5ft in any of the 360 degree directions. Any building element other than window is considered an obstruction of line of sight. Window is assumed to have transparency. When considering view towards sky, the view is expected to not have an obstruction but does not consider context farther than 25 ft or visibility of sky.
After the Quality Views Score has been calculated for each grid cell comprising the floor, the scores are assigned to a color to generate a heatmap. The purpose of this heatmap is to provide a visual representation of view's effectiveness for the entire assessment of each view type.
Why you should know the quality of your building's view?
Designing for quality views involves consideration of building orientation and site design, facade, and interior layout. In particular, Healthcare projects may be required to rethink the fundamental building typology. Integrated design enables project teams to identify potential compromises.
Building occupants who can visually connect with outdoor environments while performing everyday tasks experience greater satisfaction, attentiveness, and productivity. Workers seated at computers, who often develop eye strain or dry eyes from looking at their screens for extended periods without a break, find relief in attractive distance views. In healthcare facilities, providing patients with views and access to nature can shorten hospital stays and reduce stress, depression, and the use of pain medication. Views to the outdoors also connect the occupants with natural environmental cues, such as diurnal changes from light to dark and the changes in light from season to season, which are important for maintaining natural circadian rhythms. Disruption of these rhythms can lead to long-term health care problems, including mental disorders.
What are the differences between the cove.tool QV analysis and LEED credit description of Quality Views Assessment?
>Differences listed below;
- Atria views will not be calculated into the final quality views credit in cove.tool.
- For View Type 2 - Sky & Context, cove.tool only accesses for two of the following assessments: (1) flora, fauna, or sky; (2) movement; and (3) objects at least 25 feet from the exterior of the glazing.
- The quality views assessment does not include view type 4: views with a view factor of 3 or greater, as defined in “Windows and Offices; A Study of Office Worker Performance and the Indoor Environment.” As this assessment requires knowing programming placement.