Roofing Material RKK: RKK 400, 420A And 420B, Their Decoding And Technical Characteristics In Accordance With GOST, Use For The Roof And Other Areas

2024 Author: Beatrice Philips | [email protected]. Last modified: 2024-01-18 12:09

Despite the fact that a wide selection and range of new and modern roll materials for arranging roofing is presented on the construction market today, the consumer still most often prefers the good old roofing material, the quality and reliability of which has been tested over the years. It is characterized by a wide range of applications, it can be roofing and waterproofing.

In this article we will tell you in detail about the roofing material of the RKK type . Let's define the scope, features and technical parameters of this type of roofing material.

What it is?

The process of production of roofing felt from beginning to end is regulated by a regulatory document, namely GOST 10923-93 “Grades of roofing roofing felt. Technical specifications . Absolutely every roll of roofing material that comes off the production conveyor, according to regulatory enactments, must be marked. Marking is an alphabetic and numerical abbreviation that carries complete information about the material.

You can often find roofing material with the RKK marking. Here is the transcript of this abbreviation:

• P - type of material, roofing material;
• K - purpose, roofing;
• K - type of impregnation, coarse-grained.

Consequently, Roofing material RKK is a material that is intended exclusively for roofing and has a coarse-grained impregnation.

Roofing felt RKK, in addition to letters, also has numerical values in the abbreviation, which indicate the density of the base. It is based on cardboard, and the numbers indicate the density of this material - the higher it is, the better and more reliable the roll coating.

RKK has a number of advantages and features, including:

• high waterproofing properties;
• resistance to mechanical stress, ultraviolet light, temperature extremes;
• long service life;
• affordability.

Specifications of brands

According to GOST 10923–93, RKK roofing material can be produced in several varieties.

Let's take a look at the most popular and commonly used brands of coarse-grained roll roofing material

• RKK 350B . This is one of the most commonly used grades of material. It is most often used as the top layer of roofing. The main raw material in the process of its production is dense cardboard, which is impregnated with low-melting bitumen. The upper layer of RKK 350B is a coarse-grained dressing made of stony chips.
• RKK 400 . It is a very reliable and durable material. It is based on high-quality bitumen and thick cardboard, which makes it possible to use it not only as a roofing material, but also for waterproofing works.
• RKK 420A and RKK 420B . These are roll materials of the highest standard. They are used as a finishing layer of roofing. The canvas is made of very dense cardboard, due to which the service life of these brands is doubled and is 10 years. These types of roofing material are resistant to wear, mechanical stress, various weather conditions. They have excellent waterproofing properties. The letters "A" and "B" after the number indicate the brand of roofing cardboard, the absorption coefficient and the time of its impregnation. The letter "A" at the end of the abbreviation means that the absorbency of the cardboard is 145%, and the impregnation time is 50 seconds. The letter "B" is assigned to roofing material, which is characterized by an impregnation time of 55 seconds and an absorption coefficient of 135% or more.

All parameters and technical characteristics of any brand are determined in laboratory conditions by carrying out tests provided for by GOST. And only after they are finished, markings are applied to each roll of material.

More detailed information on the physical and technical parameters of material grades can be found by looking at the table

Roll material grade	Length, m	Width, m	Useful coverage area, m2	Weight, kg	Base density, gr	Moisture absorption coefficient,%	Thermal conductivity, ºС
RKK 350B	10		10	27	350		80
RKK 400	10		10	17	400	0, 001	70
RKK420A	10		10	28	420	0, 001	70
RKK 420B	10		10	28	420	0, 001	70

Scope of application

Roofing material is an ideal building material for roofs. It is reliable, has excellent properties and characteristics, and is inexpensive compared to other coating materials. Although it is intended for roofing, it is most often used as a finishing layer, it can also be used for waterproofing - both the roof and the foundation. High physical and technical parameters of the material, namely thick and durable cardboard and the presence of coarse-grained impregnation, contribute to this.

But, be that as it may, nevertheless, experts recommend using the material exclusively for its intended purpose.

It is not recommended to use RKK roofing material as a lining material.