10/30/2023 0 Comments Gutter detail perpedicular gable roofs![]() Structural system with the central water collection channel_© Structural system with the central water collection channel_© 6. ![]() Geographical and climatic conditions may influence the angle of inclination chosen.įor example, in areas that receive heavy rainfall or heavy snowfall a greater angle of inclination would be required whereas in an area that receives less rainfall or snowfall an acute angle of inclination would be sufficient to carry out the functions of drainage and water collection on the roof. This type of roof can be designed in all angles but, most commonly an angle of inclination within the range of 15-30 degrees is used. The unique quality of the roof surfaces sloping inwards creates an opportunity for water collection at the valley to be used for various purposes. Inclination Of Roof To Allow Water Drainage And Collection | Butterfly Roofing Appropriate shading of perimeter walls_© 5. In such scenarios, additional heat and glare cutting mechanisms or devices need to be installed either internally or externally to maintain thermal comfort in the interiors. Hot ClimateĪ butterfly roof would work well in a cold climate since it allows for a large amount of daylight and along with it a sufficient quantity of heat into the interiors through the large peripheral walls.īut these very qualities may be problematic for a hot climate that needs to reject heat and glare. Interior daylighting through butterfly roof_© 4. With higher edge walls and the roof surface sloping inwards and downwards to the center, the ratio of the depth of the room to the height of the edge walls - with an opening for light - needs to be maintained such that light penetrates deep into the room, reaching the farther point possible and lights up a maximum volume of the room, not leaving any corner dark. Such a roof system allows light to travel deeper into the habitable spaces of buildings. Column free- large glazed perimeter walls_© 3. This way the edges can be free of load-bearing structural elements and accommodate larger windows and ventilators. This demands stronger if not additional supports at the center for two reasons – firstly to carry heavy loads gained by the accumulation of water or snow on the roof and secondly to allow for a column-free periphery. Although in an ordinary gable roof, sloped like a pyramid the load would be carried downwards away from the center-ridge as against a butterfly roof where the central valley portion would carry a significant amount of the load of the roof. Since in essence a butterfly roof in an inverted gable roof the structural system would include a combination of trusses, rafters, purlins, and roof tiles (or any roofing material alike). Aids In The Designing Of Column Free Perimeter Walls AsymmetricalButterflyRoof_© Higher Perimeter walls_© 2. The inward slope of the roof allows for the collection of water at the ridge through a central water collection channel connected to a drainage spout. One of the most advantageous aspects of a butterfly roof is its ability to provide longer and higher perimeter walls which in turn provide more wall surface area to accommodate larger windows and ventilation openings. Daylighting And Water Collection | Butterfly Roofing William Krisel’s design of a butterlyroof_© 1. Listed below are some of the characteristics and design considerations to be taken into consideration while designing a butterfly roof. ![]() As opposed to a traditional gable roof, the roof surfaces of a butterfly roof slope inward to meet at a central valley, positioning the eaves slightly higher than the central ridge.Īlso known as a V-roof, this particular roof system was popularized in the 1950s by the works of architect William Krisel in his designs of several tract houses of Southern California. A butterfly roof, named after its resemblance, to the shape of a butterfly’s wingspan, is simply an inversion of a gable roof.
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