Table of contents:
 General Provisions
 Calculation of the number of profiles
 Calculation of panels
 Roof departure finish
 Pediment trim
 Siding cost
Video: Siding Calculation: How Not To Make A Mistake When Purchasing Panels And Components
2023 Author: Douglas Hoggarth  [email protected]. Last modified: 20231126 20:16
 General Provisions

Calculation of the number of profiles
 Drain rail
 Start profile
 Corners
 Window framing
 Finishing profile
 Calculation of panels
 Roof departure finish
 Pediment trim
 Siding cost
Vinyl panels (siding) are one of the most popular types of cladding for a ventilated facade system. Ease of installation, durability and neat appearance made it highly demanded in construction and repair.
General Provisions
Vinyl siding is the finishing stage of exterior decoration or reconstruction of exterior wall surfaces. It has a flexible way of attaching to selftapping screws through perforations. The base on which the panels are attached is a crate (or counterlattice), prealigned with the cords. The ends of panels and profile elements do not require perfectly precise trimming, because overlap with factory edges, or enter the factory grooves and niches. This greatly simplifies and speeds up installation.
In addition to the panels themselves, the finishing kit includes:
 J profile.
 Fprofile.
 Outside corner.
 Internal corner.
 Start profile.
 Finishing profile.
 Hprofile, connecting strip.
There are also additional combined elements:
 Wind Jprofile  Jrail with 200 mm wide panel.
 Onesided corner  corner profile with 200 mm panel.
Calculation of the number of profiles
Consider the amount of material in the order of installation.
Drain rail
This element is attached along the perimeter of the building above the plinth, or it creates a false plinth itself. It is a plastic cornice and is installed with an overlap of 20–30 mm. The length of one profile is Lstart = 3800 mm. The number of this profile can be calculated by the formula:
L _{start} = (P _{base} + 5%) / 3.8 (rounded up)
Start profile
This profile is a separate latch, a copy of the one at the top of the panel. It is needed to fasten the panel of the first (starting) row. Plank length  3580 mm. Usually it is mounted on top of the drain bar or together with it. The number of the starting profile will be equal to:
N _{start} = P _{building} / 3.5 (rounded up)
Corners
The main and most expensive type of profile is the outer or inner corner. Usually its length is 3 meters. To determine the number of profiles, you need to calculate how many whole pieces of planks go to one corner, and multiply by the number of corners of the building:
N _{corners} = H _{corner} / 3 x N _{corners}
If the height of one corner is in the range from 3.1 to 3.4 m, 3 pieces may be needed for two corners. profile (if the trim is not sharp).
Window framing
Based on the peculiarities of the installation of windows and the general appearance of the building, you can choose different types of the main profile (window strip) for finishing the external slopes:
 When the window is flat, the frame is located along the outer plane of the wall. The window can be finished with an outer corner.
 With a medium and deep planting of the window  the frame is located 50–180 mm from the outer plane of the wall. The window is finished with a window strip, or a wind Jstrip with a plane (3 m). The platband will be thin.
Since the opening is cashed from 3 sides, we take the vertical dimension as a, and the horizontal dimension as b. In this case, 80100 mm will be used for trimming from each edge of the plank. Formula for calculating a window strip for one opening:
N _{window strip} = (a x 2 + b + 500 mm) / 3 (rounded up)
The number of profiles for all openings can be calculated using a different formula:
 N _{window strip} = (A + B + N _{openings} x 0.6) / 3, where
 A is the sum of the lengths of the vertical sides of all windows;
 B  the sum of the lengths of the horizontal sides of all windows.
Finishing profile
It is installed in each opening so that the free part of the window strip fits into it and overlaps the manual trimming. It is also used for filling the last row if the panel fits with a shallow edge. The length of the finishing strip is 3800 mm.
N _{finish bars} = (A + B + 10%) / 3.8
Calculation of panels
The first thing to do when calculating is to determine how many whole panels will fit in one row. The length of one panel should be 60 mm more than the lathing pitch (but not less than 200 mm). Dividing the length of each side by the length of one panel, we get the whole number of panels and the size of the remainder, which will go to the next row. If it turns out that the remainder is less than the lathing step, it will either have to be "written off" or an additional edge of the lathing has to be added.
As you know, each siding panel has an overlap for connecting to adjacent panels. Their standard size is 3660 mm. The working width of one panel is 200 mm, the length is 3600 mm. Total working area of one panel:
S _{pan} = 3.6 x 0.2 = 0.72 m ^{2}
To calculate the number of panels, you need to calculate the area of the wall to be sheathed and divide the result by the area of one panel. Round the result up.
Roof departure finish
In the traditional approach, the roof overhang is leveled and perforated "soffits" for ventilation are arranged. This is done with an Fprofile (wall) and a combined Jrail (with a plane).
The number of Fprofiles (3800 mm) will be equal to the perimeter of the building at the junction of the soffit and the wall. The number of Jrails will be equal to the length of the roof edge (wind board).
The number of spotlights will be equal to the number of the length of the windboard multiplied by the length of the overhang. The length of one soffit sheet is 3000 mm.
Pediment trim
This particular site is the cause of many budget miscalculations. Due to the nuances of the triangular pediment, sometimes it is necessary to deliver 1 or 2 panels separately. There are two ways to accurately calculate the number of panels per triangular pediment:
 Local. If scaffolding is already installed at the workplace, you can divide the height of the gable into strips of 200 mm. This will be the approximate arrangement of the panels. Then measure them with a tape measure and add up the individual results. Add 10% to the resulting number and divide by the length of one panel (3600 mm), round up.
 According to the sketch. Take measurements from the gable and draw a sketch to scale. Then repeat the steps from the first subsob, breaking down the sketch.
Siding cost
It is worth noting that the design of the panel turned out to be so successful that it is copied and repeated in metal and other materials. This is how it turns out, for example, metal siding laminated to the texture.
Comparative cost of siding panels
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