![]() If your drawing is done to scale (We suggest 1/4" grid graph paper with each square equal to 1 foot), you can then pencil in 8' tall Porch Posts (as a starting place) with a 6" tall beam above them that is 10' from the front of the house. It often helps to draw a 'stick figure' end view of your proposed porch, starting with a vertical line representing the front of your house, with marks indicating the top and bottom of the door, and (if a 2-story house) the top of the first floor windows, and the bottom of the 2nd floor windows. Other factors that should be taken into account when determining ceiling height include elevation of the porch floor above grade and whether to have a flat ceiling, a vaulted ceiling (ceiling attached to bottoms of rafters), or no ceiling (exposed rafters). (For 1-story homes, it is often better to start the porch roof on top of the main house roof to gain extra vertical height.) Therefore, a properly designed porch becomes a matter of maintaining as much porch depth AND ceiling height as possible, while also working within the confines of the wall space available on the house, type of roofing planned, etc. And, of course, roof slope must be sufficient for the type of roofing to be used. However, the deeper the porch, the lower the front eave will be for a given roof slope. To feel spacious, your porch should also have at least 8 feet of ceiling height, but porches with even taller ceilings are quite traditional. Standard ceiling height inside a house is 8 feet. The Third Dimension is undoubtedly the most overlooked aspect of modern porches and is much more important in creating a great porch than most people realize. Your porch roof should have adequate fascia and visible beam height, together with adequate soffit depth, to not only be visually pleasing, but also to permit the inclusion of "The Third Dimension" now or at a later time. ![]() If the Soffit is installed perpendicular to the face to the Beam, it will be much easier to add decorative trim in this area.Ĭross section of lower eave of a typical porch. The Soffit is the material applied to the bottom of the Rafter ends to "box in" the overhang. See drawing directly above.įascia boards are applied across the ends of the Rafter Tails (the section of the Rafter that extends beyond the Beam creating the roof overhang). Joists and Rafters to the Ledgers, both for their ease of Recommend the use of steel Joist Hangers as the method of fastening Receive the ends of either the rafters or ceiling joists. Ledgers are boards fastened horizontally to the building so as to However, most modern residential roofs are sheathed with plywood and covered with composition shingles, so leaving the rafters exposed also exposes the plywood to view.Ĭonnecting the porch to an existing wall. This can be very presentable when the roofing is metal or wood shingles. Also, some rustic building styles omit the ceiling altogether and leave the rafters exposed. Ceiling Joists can be omitted if the ceiling is to be installed to the bottom of the rafters. If a porch is 8 feet deep from the face of the building to the Beam, and the Rafters are installed with a 4/12 Pitch, then the Rafters will intersect the face of the building 32'' above the porch Beam.Ĭeiling Joists are structural members placed on top of the Beam next Horizontal measure." Hence, a 4/12 Pitch roof will rise 4" for every 12" it travels. "the number of feet the roof rises vertically for each 12 feet of The Pitch (slope) of a roof is defined as ![]() Rafters are typically spaced 16" or 24" apart along the They extend at a slope up to the face of theīuilding. Rafters are structural members that are set perpendicular to and on However, the design of the eave is important to our discussion of porches. Therefore, we recommend seeking professional assistance in determining a proper roof structure for your porch. Home > Products > Porches - START HERE! > ONLINE PORCH GUIDE > Understanding the Porch > Structural Porch Components > Roof & Ceiling
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