🇨🇩 Democratic Republic of the Congo · Roofing · Updated 2026
How much roofing do you need to build a house in the Democratic Republic of the Congo?
A 150 m² single-storey house in the Democratic Republic of the Congo needs roughly 209 m² of roofing — about 1.39 m² per m² of floor area. That is computed from Democratic Republic of the Congo construction conventions, including the local wastage allowance.
Roofing quantities for a house in the Democratic Republic of the Congo, computed from how buildings are actually put up here rather than from a global average. The tables below run from a small 50 m² dwelling to a 400 m² family home, and the method section shows how to reproduce every figure by hand so you can adapt it to your own plan.
Roofing by house size in Democratic Republic of the Congo
| Floor area | Roofing required | Per m² of floor |
|---|---|---|
| 50 m² | 77 m² | 1.54 |
| 75 m² | 110 m² | 1.47 |
| 100 m² | 144 m² | 1.44 |
| 150 m² | 209 m² | 1.39 |
| 200 m² | 274 m² | 1.37 |
| 250 m² | 339 m² | 1.36 |
| 300 m² | 403 m² | 1.34 |
| 400 m² | 530 m² | 1.32 |
Single-storey. The per-m² rate falls as the house grows — a small house has more wall and roof per square metre of floor than a large one, which is why these are computed size by size rather than scaled from a single rate.
Where it goes — 150 m² house
Roof covering area 173 m² plan opened out at 25° plus 10% laps | 209.4 m² |
Fascia, barge & rainwater goods Perimeter plus gable rake | 57.5 m run |
What drives the quantity in Democratic Republic of the Congo
| Factor | Local value | Effect |
|---|---|---|
| Roof pitch | 25° | Pitch converts plan area to real surface: at 25° the roof is about 1.10× the plan area beneath it. |
| Eaves overhang | 450 mm | Overhang adds covering area all the way round and is routinely left out of quick estimates. |
| Laps | ~10% | Side and end laps on sheeting, or headlap on tiles. Never covered by the geometric area. |
| Climate | subtropical | Rainfall intensity and UV exposure drive covering choice and gutter sizing more than load does. |
How to calculate it yourself
- 01
Take the plan area of the building and add the overhang all round (0.45 m here).
- 02
Divide by cos(25°) — a factor of about 1.103 — to get the true sloping area.
- 03
Add about 10% for laps and cutting at hips and valleys.
- 04
For sheets, divide by the cover width (not the overall width) of the profile you are buying, then round up to whole sheets of the right length.
- 05
Measure gutters, fascia and barge boards on the perimeter separately — they are priced per metre run, not per m².
Buying and site notes
- —Order sheets cut to the full rafter length where possible. Every end lap is a leak waiting to happen and adds material.
- —Fixings are not a rounding error on a large roof — count them, especially in high-wind areas where the fixing schedule is prescribed.
- —Check the gutter and downpipe sizing against local rainfall intensity, not against habit.
Get every material measured off your own plan
This page works from a representative footprint. Upload your dimensioned drawings and get the full schedule — every material, measured from your real geometry and priced in CDF (FC).
Take off my drawingsRoofing in Democratic Republic of the Congo — frequently asked
How much roofing does a house need in the Democratic Republic of the Congo?
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A 150 m² single-storey house in the Democratic Republic of the Congo needs roughly 209 m² of roofing — about 1.39 m² per m² of floor area. That is computed from Democratic Republic of the Congo construction conventions, including the local wastage allowance.
How much roofing per square metre in the Democratic Republic of the Congo?
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About 1.39 m² per m² of floor area for a single-storey house. The figure is not linear across sizes — a small house has proportionally more wall and roof per m² of floor than a large one, which is why the table above is computed size by size rather than scaled from one rate.
What changes the quantity of roofing needed?
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Roof pitch (25°) — Pitch converts plan area to real surface: at 25° the roof is about 1.10× the plan area beneath it. Eaves overhang (450 mm) — Overhang adds covering area all the way round and is routinely left out of quick estimates. Laps (~10%) — Side and end laps on sheeting, or headlap on tiles. Never covered by the geometric area.
Is wastage included?
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Where it applies, yes — a 5% allowance is carried on the perishable materials (walling units, tiles, paint). Bulk materials like sand and stone carry handling loss instead. Ordering the theoretical quantity with no allowance reliably means a second delivery at a worse price.
How accurate is this for my own house?
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It is a planning quantity derived from a representative rectangular footprint, so it is the right order of magnitude and internally consistent — good for budgeting and for checking a supplier's list. It is not a measured takeoff of your plan. Upload your dimensioned drawings to get quantities measured off your real geometry and priced in CDF.
Are roofing prices included?
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No, deliberately. Material prices in the Democratic Republic of the Congo move week to week and vary by region, so a price printed on a static page would be wrong within a month. This page gives you the quantity — take that to two or three local suppliers and the price will be current and competitive.