Figure 1: Showing the relationship between the properties, no.50 on left and no.52 on right.
Figure 2: Northeast elevation of proposed development of no.50 Wybourn Drive.
A grainy, blue-tinted photograph showing a detached house with a pitched roof and an attached structure to the left, with several cars parked in the driveway.Architectural elevation drawing showing a proposed roof extension with labels for ridge-lines and angles.
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An aerial site plan showing a residential property with overlaid compass direction and sun angle analysis lines.
Figure 3: Plan view of no.52 (top) and no.50 (bottom) with proposed extension area shown by diagonal-hatching.
Figure 4: Solar elevation for the Isle of Man for December 21st to June 21st, by month.
Figure 5: Solar elevation for the Isle of Man for June 21st to December 21st, by month.
Conclusion
Various photographs taken during a site visit to no.52 Wybourn Drive were used to estimate the level of the window cills on the southeast side of the property in relation to the adjacent property no.50. The estimated cill height for no.52 was transposed onto figure 2, which shows the northeast elevation of the proposed development of no.50 Wybourn Drive. The figure also shows that, relative to the cill height of no.52, the proposed raising of the ridge-line will increase the subtended angle with the horizontal from 24 degrees to 27 degrees.
Figure 3 shows a plan photograph of the properties with the proposed extension to no.50 overlaid with diagonal-hatching and directions from the centre of the southeast face of the conservatory of no.52 indicated relative to True South (180 degrees). The southwest end of the existing ridge of no.50 lies 20 degrees east of south (160 degrees True) whereas the westernmost end of the proposed extension would be 6 degrees west of south from the conservatory (186 degrees True).
Figure 4 shows solar elevation for the Isle of Man for 21st/22nd day of each month from December 21st through to June 21st (blue curves, with time of day overlaid in red, all times UTC). Figure 5 shows similar information for the period 21st June through to 21st December.
The increased ridge elevation for the proposed development of no.50, and the extension of the property towards the southwest, have been transposed onto the solar elevation
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diagrams (figures 4 and 5) with the increased shadow effect (for no.52) shown as the shaded grey area on both diagrams.
The projections suggest that the proposed raising of the ridge of no.50 will mean that direct sunshine reaching the window cill level of no.52 will occur around 20 to 30 minutes later each morning during the summer months and that the proposed southwestward extension of the property will delay direct sunshine reaching the centre of the southeast face of the conservatory of no.52 by around 1.5 to almost 2 hours during the period from mid-October to late-February.
La Hisscott
Dr. L. A. Hisscott, C.Phys., C.Met.
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