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How do we compare price offers for different kind of roofs?

Often, each of us is tempted to choose the lowest price offer, without really comparing multiple offers.

Factors influencing the roof type:

  • - light roofs or heavy roofs;
  • - appearance: models and colors;
  • - warranty and lifespan, level of watertighness;
  • - material price + installation price;
  • - brand awareness;
  • - the novelty of the product;
  • - bid estimation time;
  • - production, delivery and installation time;
  • - the recommendation from the architect;
  • - other recommendations (builders, friends).

How to choose the roofer / installer

The first selection should be based on the type or types of the roof you choose. Analyze the offer and ask what it contains.

If you have more than one offer:

  • - you must check that the area mentioned in the offers is the same. For the same type of cover, the differences should not exceed 2 - 3%. For other types or roofs, this can be up to 20%.
  • - the offer must contain all the accessories (box barges, barrel trims, valleys, eaves flashings, fasteners).
  • - compare the quantities.
  • - check that the offer contains breatheable membrane and search information about its qualities. The use of inappropriate roofing membrane can lead to a malfunction of the thermal insulation and consequently to subsequent costs. Also, the type of roofing membrane can influence the type of thermal insulation.
  • - the offer must contain a rainwater system (gutters and downpipes, etc.). Check the quantities, the material from which they are produced (metal, plastic), the diameter of the gutters and the downpipes.

Before the final decision, ask for the documents certifying the quality of the product: the declaration of conformity (CE), the warranty certificate, the technical sheet. The products must contain the traceability of the product (product name, country of origin, processing date / batch number, CE mark on the back or on the packaging label). Sometimes, the products supplied are not the original products. Do not hesitate to contact the manufacturer or importer to make sure you receive the original.

Do not fall into the trap "The product is / looks just like ...", "It`s similar ..." and "It`s a lot cheaper than ...".
Usually, when we have two supposelly identical offers, but with a significant price difference, we always tend to suspect (and even remove from negotiation) the one with the highest bid. But shouldn`t we ask ourselves the question "Why is the other offer so much lower?" Does not the lower price hide a lower quality? This is not always true, but it is worth asking this question.

When signing the contract, do not hesitate to enter as a clause, that the roofer should assum any additional costs over 3-5%. The estimation cost is the exclusive result of the roofer, which is why it is not justified to pay extra fees in case there are no changes generated by you. Failure to comply with the plan quotas, when the roof is made, can not be assumed by the roofer. In such case, simply request a recalculation of the offer before delivery.

Based on this analysis, you will decide at least about the type of roof, model and color.

To choose the distributor you will work with, make sure it has specialized installers or trained partners. Ask them to show you at least one completed roof. It is preferable to avoid installers without reference or with a much lower cost of work. Ask for both warranty for materials and installation. This way you can stay assured that you have received all the materials from the offer, and also discourage "occasional installers."

Tips on choosing roofing foils and vapor barriers:

There are two large categories of roofing membranes that ensure the long-term efficiency of the insulation: inside, a vapor barrier and outside, an anti-condensation foil. The vapor barrier is designed to prevent the air from flowing outdoors and to limit the amount of vapor transported outwards. Anti- condensation foil allows the vapor that reaches the thermal insulation layer to exit as quickly as possible and prevents formation of condensation that would affect thermal insulation. At the same time, it prevents condensation, which can form under the roof, from entering the thermal insulation layer.

In order to choose the right type of membrane to protect your roof, you need to consider a number of criteria: vapor permeability (Sd value), type of roof (with hardboarding / without hardboarding, ventilated/ unventilated, uninhabited, roofing type (ceramic, concrete, metal, other types ...).

Good to know:

  • - Sd value < 0,5 m – anti- condensation membrane For anti- condensation membranes, the Sd value should be as low as possible. The most effective anti- condensation membranes have Sd values ranging from 0.15 m to 0.02 m. The anti- condensation membranes has to be stretched out, overlapped at least 10 centimeters and installed from the eaves to the ridge. It must be fixed only to the rooftops and then the battens are installed along the rafters. These battens will cover the fastening area and will allow ventilation and leakage of any condensation.
  • - Sd value > 2 m – vapor barriers (inside). In this case, Sd must be as high as possible. The most effective vapor barriers have Sd values ranging from 100 to 150 m. With regard to vapor barriers, it is extremely important to seal the membrane perfectly (in the areas of overlapping, fixing and connecting to walls, ceilings, floors, frames windows in the puncture zones) with the appropriate accessories recommended by the manufacturers.

Tips for installing the roof:

  • - The structure of the wooden structure must be calculated and made according to the type of roofing system chosen and its weight. In order to load the structure of the roof to as low pressure, and also to optimize the materials, it is preferable to choose a tight, lightweight and weathertight roofing system.
  • - Choose an experienced installer who can give you a waranty certificate for the installation.
  • - Check if the tiles are properly stored from the date of purchase to the moment of installation, ensuring that there is a proper ventilated area for storage.
  • - Make sure the products are not damaged before installing.
  • - Do not use abrasive discs or tools that cause excessive local heating, leading to damage to the corrosion protection layer.

Tips for Roof Maintenance:

  • - Novatik tiles do not require special maintenance, but they must be inspected regularly, at least once a year, the smooth surface of the panels does not allow growing of muscles and lichens, and dust and other impurities are easily removed by the rain. The rainwater system and the intersection areas of the slopes collecting the water (valleys) shall be checked periodically and cleaned from dry leaves, branches or other impurities affecting the proper functioning of the roof, the degradation process being accelerated especially when the impurities on the roof are not washed by the rain. Vegetal debris can clog the gutters and downpipes, preventing water leakage, with moisture causing wood structure rotting under the roofing material.
  • - Accidental scratches can be protected using retouch spray.
  • - Any failure or failure of the coating will be repaired immediately to ensure a maximum lifespan of the roof
  • - Once the instalation has been completed, the roof must be cleaned from objects or leftovers, like pieces of metal, sawdust, chips or any object (metallic or not).
  • - Removing the accumulated snow on the roof requires that the process should be carried out with care so that the protective layer of the roofing tiles is not affected.
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