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Home | Our Blog | Different Types of Flat Roof Material Options - Which is Best?

Different Types of Flat Roof Material Options - Which is Best?

posted on Nov 15, 2019

There are two basic types of covering for roofs: pitched and flat horizontal. Flat coverings were initially spread mainly in the southern Mediterranean and Asian countries, and pitched ones were found in countries of northern Europe.

The explanation for this is quite simple: The covering should provide reliable house waterproofing and withstand the accumulating loads. This problem is not so acute in sunny southern countries; there, people usually choose the cheapest option of covering the building. In the northern countries, a pitched roof is a necessary option, albeit more expensive when constructing.

Flat roof materials

Reasons to Choose Flat Roof

Until recently, flat roofs have been designed only for industrial facilities or multi-story residential houses, while traditional gable, mansard, or hip types have been constructed for low-rise buildings. But the technology and improvement of building components’ market have made it possible to use horizontal coverings in individual housing development.

With a private house or cottage, it’s not hard to build a second and even third floor instead of the attic, and place a sports room, resting place, or a small greenhouse in the additional area. All of this contributes to the growing flat construction popularity, while modern technologies and building materials make it possible to not only reduce residential house building costs but also provide it with significant reliability and durability.

Pros for main flat coverings include their simplicity and cheapness. If the price of arranging a pitched roof is about 20–25%, and sometimes even 50%, of the total cost, then investments in flat roofing materials will be mainly determined by the costs of strengthening the upper floor.

Best Material for Flat Roof

The components used for horizontal coverings should provide high-quality waterproofing for the entire structure. Nowadays, materials used for flat roofs must have these requirements:

  • Durability
  • Lightweight
  • Chemical protection
  • Heat insulation
  • Resistance to solar radiation
  • Biostability
  • Fire-resistance
  • Acoustic isolation
  • Lasting quality
  • Cost-effectiveness
  • Flexibility in application

Flat coverings consist of a collection of materials that provide reliable house waterproofing and maintain an optimal microclimate. These include:

  • Primers and mastics for reliable installation, ensuring joints tightness and additional waterproofing
  • Bituminous covering system
  • Drainage system
  • PVC membrane to create a durable and reliable waterproofing layer

In such a way, traditional paper, cardboard, and bitumen roofing products are inferior to modern components in all respects.

Flat roofing materials

Flat Roofs Types

There are three basic types:

  • Single-ply membrane roofing (for example, EPDM)
  • Modified bitumen covering
  • Built-up roof (BUR)

The polymer membrane has become more and more widespread in building coverings’ repair and decoration areas, and it’s in demand in the USA, Canada, and Europe. Membrane roofs’ popularity is explained by their high reliability, rich color palette, good adaptability to different temperatures (whether low or high) and durability (life span up to 40 years).

EPDM is the latest technology (+/- 55 years), while BUR is the oldest one (+/- 120 years).

EPDM rubber covering is made from environmentally-friendly recycled rubber materials. In addition to pure EPDMs with a rubber base, composite flat roof replacement materials are also available. Their upper layer is traditionally rubber, while the lower one is flexible bitumen-polymer.

Advantages:

  • It differs from other membranes with increased elasticity (about 400%) and lower cost.
  • The coating is resistant to any weather conditions.
  • EPDM roofing is durable, life span is 30 to 50 years.

Disadvantages:

  • It tends to absorb rather than reflect heat, which makes it energy-inefficient.
  • It’s not very environmentally friendly.

EPDM rubber covering prices vary from $4 to $8 per square foot.

PVC Membranes are innovative waterproofing flat roof materials. PVC roofs are a single-layer type based on elastic polyvinyl chloride (PVC-P). Hot air welding provides it with absolute imperviousness.

The main pros are:

  • PVC buildings’ coverings are sturdy and elastic.
  • Membrane coatings are an excellent option for rough and deformed surfaces, as they have high deformation ability.
  • PVC membranes meet all fire safety requirements.
  • High vapor permeability eliminates the possibility of condensate moisture stagnation.
  • Being lightweight can significantly reduce the main structure load.
  • A single-ply membrane simplifies the process of covering.
  • Ease of installation makes it possible to conduct the repair job in almost any weather condition.

Installing a PVC membrane costs about $7 to $11 per square foot.

Built-up roof (BUR) uses tar and gravel to create a waterproof layer over the covering. This is one of the most costly types of roofing materials for a residential building. Here are the pros and cons:

Pros:

  • Simple repair or dismantling
  • Life span is about 10 to 15 years with proper maintenance and repair
  • Several types of built-up roofing for any demand: smooth and ballast asphalt, cold layer, etc.
  • Excellent protection against water, ultraviolet rays, and adverse weather conditions
  • Low operating and maintenance costs over the entire life span
  • Durability due to gravel use

Cons:

  • Installation takes a lot of time
  • Prone to damage from wind and rain
  • May need to dismantle the entire roof to determine the source of damage

The cost varies from $5 to $8 per square foot.

For 60 years, BUR has been the only option. Then, in the early 1960s, a new technology called Modified Bitumen was introduced. This type of covering has reinforced the proven effectiveness of BUR, but also added layers for strength and durability.

Pros:

  • Applied in overlapping reels to create large seamless areas
  • Available in a variety of application methods
  • Requires low maintenance due to its durability
  • Provides better elasticity and flexibility at low temperatures
  • Easy to set up
  • Affordable
  • Provides better durability than BUR, with the same ease of installation as EPDM

Cons:

  • Some application methods require an open flame/burner, which requires special safety measures.
  • Overlapping seams must be properly glued to prevent possible water leakage.

The price can range from $3 to $6 per square foot.

Spray-On Roof (Silicon spray). It may not seem the safest or the most effective coating, but it is one of the most expensive types of roofing. This method uses a coating to repel water and has one important advantage: there are no seams here.

Price varies from $3 to $6 per square foot.

TPO roofing membrane. It’s advised to use this type on the construction of complex buildings, in particular – buildings of industrial and social purpose including enterprise workshops, administrative buildings, sports facilities, hotels, recreation centers, cafes, and restaurants.

Pros:

  • Elasticity, resistance to deformation at sub-zero temperatures
  • Life span is up to 50 years
  • Low water absorption, vapor barrier properties
  • Fire-fighting chemical components
  • Membrane production technology involving the antifungal components use

The cost ranges from approximately $5 to $8.50 per square foot.

The use of top-notch roofing materials and technologies will make it possible to get away from the standard design, as well as to diversify individual solutions and options.

Learn more about flat roofs by calling Legacy Service at +1 267-961-7088

Posted on Nov 15, 2019 in Roof

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