Renovate, redo his house roof - 8 questions to ask before rebuilding a roof
iStockphoto / ArturHenryk
The roofing is often a priority when you renovate your house. Fortunately, the most common materials (tile, slate or zinc) have a rather long life, we can sometimes only replace the bare necessities ... Here are 8 questions to ask before renovate the roof from his house, from the insulation to the replacement of the frame, through the choice of materials, the budget and the watertightness.
When is it time to redo his roof ? Should we renovate the frame? What are the regulations? Which insulation to choose? How to make the roof waterproof? What budget do you need and which materials to favor? All the answers, and more ...
Refurbish the roof asks to respect regional particularities. Moreover, the authorities require you to do so if you live in an architectural heritage protection zone or in the perimeter of a listed building. And apart from these particular cases, it is the town halls or the DDEs which impose the rules of the game, the materials and the colors. In principle, you are exempted from any declaration if you redo your roof to the identical. But beware, if the cover material changes, you have to file a preliminary declaration works at the town hall of the town. And if you are in a classified area, theapproval of historical monuments is necessary. As to building permitit is required if you raise the roof or change the pitch. Moreover, resort to an architect is mandatory if the work increases the total living area of the house to 150 m2 or more.
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1. When was the last roof repair?
If the last cover took less time than expected, the roof may have a design flaw (lack of inclination, overexposure to winds). The consultation of a professional (roofer, architect) can prove useful: he will point out the defects or the weaknesses to be corrected.
See also> Roofing: what you need to know before doing any work
2. Does the roof have to be renovated as a whole?
of the localized leaks for specific reasons (broken tiles or pier gutters, for example) do not require heavy work and are quickly repaired. On the other hand, presence of foam on the entire roof attests to the porosity of the cover. No treatment is effective in the medium term, replacement is inevitable. Warning, a new blanket is often heavier than an old one. The frame may not support this extra load!
3. What is the surface of my roof?
A medium-sized house represents a roof area of approximately 80 m2. Attention, considering the coverings, such a roof will require at least 100 to 120 m2 of roofing materials.
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4. Should the frame be redone?
Yes, when beams are broken or simply cracked or insects attacked the wood in depth. If the roof needs to be completely replaced, consider repairing your frame as well. Its life expectancy governs that of the entire roof and the cost of repair is reasonable compared to that of the roof.
5. Is insulation still effective?
A careful inspection will answer this question. all trace of moisture on the insulation (glass wool, polystyrene or vapor barrier film) should be banned and especially the cause should be determined to avoid a aggravation of disorders. If there is no insulation, it's time to think about it. And if all the coverage has to be filed, the most effective solution, insulation from the outside, can be considered. The company is more expensive but help is possible as part of environmental renovation work.
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6. Should we review the waterproofing?
Ensure roof waterproofing is the number one renovation rule. And the operation will be all the more important because, as part of the essential work, you will certainly have to make improvements in terms ofthermal insulation. The range of products is vast and likely to respond to most situations.
Major manufacturers: Sika, Siplast, Soprema.
7. What budget to consider to renovate your roof?
Depending on the answer, and the material chosen, you will choose the economical option and will have to consider starting again about 30 years later, or opt for the long term (60, 80, 100 years).
8. What materials to adopt for a roof renovation?
Your place of residence is important. Better to follow local uses who are often choices imposed by weather conditions. Thus, tiles are not recommended in case of frequent snowfall. There is little chance that your original tiles (They are certainly over 40!) are still manufactured. The contractor may be able to offer you an equivalent model. If they are still made, your original tiles are weathered, and the old / recent blending is not really appropriate if your house has character and you only remake part of the roof. Alternatively, you can turn to a material recovery complete your damaged roof. Be aware however that you will often pay these tiles (with reduced life expectancy!) The same price as new tiles. You will then be interested in changing everything, even sorting the old tiles still good to sell them yourself in the recovery market.
Removing the old cover
Count around 1,200 euros for a roof of average surface. And more if your roof contains asbestos, like almost all artificial slates before 1997 (date of prohibition of asbestos cement products). It's up to youevacuation of this toxic waste and only specialized companies can intervene on this type of site.
The control of the sensitive points:
Redo its roof: beware of storms!
The violent storms that hit France in the past forced and forced every single-family homeowner to Prevent damage that could cause unusual weather, especially on its roof. The French Federation of Tiles and Bricks has launched an awareness campaign on the need for a well-maintained roof capable of withstand high winds and heavy rains. She recommends therefore a regular visit of the roof (once a year and systematically after a big storm) by a roofer, if possible the one who put it down. In the program, a control of the sensitive points (see diagram).
Redo his roof: the green temptation
The ecologists in the soul will look for a green roof. This natural coating perfectly suited to flat roofs has the advantage of protecting against noise, absorbing too much rainwater and being an excellent heat regulator. In addition, its maintenance is almost zero. Do not forget, however, a disadvantage: not all roofs can support a vegetal layer because of its weight. In addition, some heritage architects do not look very favorably at the arrival of this kind of cover from elsewhere: "It's great for others, but not for me!" Others deplore that the plant habit retained in our regions rarely goes beyond the stage of a "sick tundra".
Redoing the roof: the evacuation of rainwater
The gutters and gutters are to choose from copper, zinc or PVC depending on the budget and the life expectancy that you expect. The evacuation system represents about 10% of a total renovation budget.