Siding calculation: how not to make a mistake when purchasing panels and components

Recommendation points

• General Provisions
• Calculation of the number of profiles
• Drain rail
• Start profile
• Corners
• Window framing
• Finishing profile
• Calculation of panels
• Roof departure trim
• Pediment trim
• Siding cost

In this article, you will learn how to correctly calculate the number of panels and other siding elements. We will also tell you how not to make a mistake when purchasing a profile for windows and a wind board. The article provides approximate prices for siding.

Vinyl panels (siding) are one of the most popular types of cladding for a ventilated facade system. Ease of installation, durability and a neat appearance made it very popular 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 fastening to self-tapping screws through perforations The base on which the panels are attached is a crate (or counter-lattice), pre-aligned 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:

1. J-profile.
2. F-profile.
3. Outside corner.
4. Inner corner.
5. Start profile.
6. Finishing profile.
7. H-profile, connecting strip.

There are also additional combined elements:

1. Wind J-profile – J-rail with 200 mm wide panel.
2. One-sided 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 mounted 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_plinth + 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 attach 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 a profile, 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 lies 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:

1. When the window is flat, the frame is located along the outer plane of the wall. The window can be trimmed with an outer corner.
2. 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 J-strip 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, 80-100 mm will be used for trimming from each edge of the plank. Formula for calculating a window strip for one opening:

• N_{window trim} = (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 trim} = (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. Finishing strip length 3800 mm.

• N_{finishing planks} = (A + B + 10%) / 3.8

Calculation of panels

The first thing to do when calculating is to establish 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 pitch of the crate, it will either have to be “written off” or an additional edge of the crate must be added.

As you know, each siding panel has an overlap for connecting to adjacent panels. Their standard size is 3660 mm. Working width of one panel is 200 mm, length – 3600 mm. Total working area of ​​one panel:

• S_pan = 3.6 x 0.2 = 0.72 m²

To calculate the number of panels, it is necessary 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 trim

In the traditional approach, the roof overhang is leveled and perforated “soffits” are arranged for ventilation. This is done with an F-profile (wall) and a combined J-rail (with a plane).

The number of F-profiles (3800 mm) will be equal to the perimeter of the building where the soffit meets the wall. The number of J-rails will be equal to the length of the roof edge (wind board).

The number of spotlights will be equal to the length of the windboard multiplied by the length of the overhang. Length of one soffit sheet – 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:

1. 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.
2. 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 for texture.

Comparative cost of siding panels

Name	Manufacturer	Price 1 m2, at. e.
Vinyl siding
FineBer	Russia	2.7
“Alta-Profile”	Russia	3.2
SNOW BIRD	Russia	3.5
VOX	Byelorussia	4.1
Royal	Poland	4.8
Docke	Germany	6.8
Variform	USA	9.5
Rough Sawn Cedar	USA	10.5
Mitten SENTRY	Canada	12.5
Other types of siding
Siding Metal	Russia	4.2
Grand Line (metal)	Russia	5.3
“Lbrus” (laminated metal)	Russia	6.1
CM Cladding (WPC siding)	Sweden	18.5

In conclusion, we add that you should not purchase material with an accuracy of 1 meter. Stock up on 1 piece. each position – this will insure you in case of damage to the sheet.