GOST EN 495-5-2012 PDF

Full title and description

GOST EN 495-5-2012 — Roofing and hydraulic‑insulating flexible polymeric (thermoplastic or elastomer) materials. Method for determination of foldability at low temperatures. The document is the Russian national adoption of the corresponding European regional standard, giving a laboratory procedure to determine behaviour of plastic and rubber roof/waterproofing sheets when folded after exposure to low temperatures.

Abstract

This standard specifies a controlled test method to assess foldability (low‑temperature flexibility/fold resistance) of plastic and elastomeric roofing and waterproofing sheets. It defines specimen preparation and conditioning, test apparatus and fixtures, test temperatures and exposure times, folding procedure and evaluation/recording of failure or cracking. The method is intended for use on sheets after manufacture or delivery (prior to installation) to classify low‑temperature performance and to support product specification, quality control and compliance testing.

General information

• Status: Introduced for voluntary national use in the Russian Federation (active as a GOST adoption of the EN text).
• Publication date: Introduced in Russia 1 July 2014; originally published in the EN system (EN 495‑5 series) in the 2012–2013 timeframe.
• Publisher: Federal Agency on Technical Regulating and Metrology (Rosstandart) — text published/distributed in Russia via the national publisher (Standartinform/Издательство «Стандартинформ»).
• ICS / categories: 91.100.50 — Binders, sealing materials and related construction products (flexible waterproofing sheets).
• Edition / version: Designation: GOST EN 495‑5‑2012 (national adoption of the EN part). Implemented as a GOST text and introduced 01.07.2014.
• Number of pages: 12 (GOST edition/catalog listings indicate 12 pages).

Scope

The standard applies to roofing and hydraulic‑insulating flexible polymeric materials (thermoplastic or elastomeric sheets) and establishes a laboratory method for determining their foldability (behaviour on folding) at specified low temperatures. It is intended for assessment of sheet material properties after manufacture or on receipt (before installation) and is not intended to assess the performance of completed waterproofing assemblies in‑situ. The scope and procedure follow the European EN 495‑5 part requirements for plastic and rubber roof waterproofing sheets.

Key topics and requirements

• Definition of the foldability (low‑temperature folding) test principle and acceptance criteria for plastic and elastomeric roofing/waterproofing sheets.
• Required test apparatus and fixtures (climatic chamber, folding jig/specimen holder, mandrels/angles where specified).
• Specimen selection and sampling rules (reference to sampling rules used for flexible waterproofing sheets).
• Specimen conditioning, specified test temperatures and exposure durations before folding.
• Detailed folding procedure (how to fold the conditioned specimen, number of cycles or single fold, observation of cracks or ruptures) and result recording.
• Reporting format and result interpretation for product classification and quality control.
• Normative references to related test and sampling standards (examples: EN 13416 sampling rules and EN 1849‑2 thickness/mass determinations for roof sheets).

Typical use and users

Typical users are manufacturers of polymeric roofing and waterproofing membranes, independent testing and certification laboratories, product specification engineers, construction product assessors, and quality control personnel. The method is used for product development, factory quality control, incoming inspection, specification compliance checks and to support technical documentation and declarations for waterproofing sheets.

Related standards

Related and cross‑referenced standards include other parts of the EN 495 series (Flexible sheets for waterproofing — low‑temperature foldability tests), EN 13416 (sampling rules for flexible waterproofing sheets), EN 1849‑2 (determination of thickness and mass per unit area for plastic and rubber roof sheets) and national GOST/R standards that cover complementary test methods for flexible roofing materials (for example, GOST R test methods addressing dimensional, tear and joint properties). Users should consult the normative references listed in the standard for the full set of related documents.

Keywords

GOST EN 495‑5‑2012; foldability; low temperature; flexibility; roofing membranes; waterproofing sheets; polymeric sheets; thermoplastic; elastomer; test method; sampling; EN 495; EN 13416; EN 1849‑2.

FAQ

Q: What is this standard?

A: GOST EN 495‑5‑2012 is the Russian national adoption of the European method that specifies how to determine the foldability (low‑temperature folding behaviour) of plastic and rubber roofing and waterproofing sheets.

Q: What does it cover?

A: It covers laboratory procedures — specimen selection/preparation, conditioning at specified low temperatures, the folding operation and criteria for identifying cracking or failure — used to classify sheet performance at low temperatures. It is applicable to polymeric (thermoplastic and elastomeric) roofing and hydraulic‑insulating sheets prior to installation.

Q: Who typically uses it?

A: Manufacturers, third‑party and in‑house testing laboratories, product certifiers, technical specifiers and quality control engineers working with roof and waterproofing membrane products.

Q: Is it current or superseded?

A: The GOST adoption was introduced for voluntary use on 1 July 2014; users should verify the current national status and any later amendments or replacements in Rosstandart or the national standards catalogue before relying on the text for compliance decisions. The underlying EN part has publication dates around 2012–2013 — check the latest EN and national catalogues for updates.

Q: Is it part of a series?

A: Yes — it is Part 5 of the EN 495 family (Flexible sheets for waterproofing — determination of foldability at low temperature). Other parts of EN 495 address different materials or test variants; consult the EN 495 series for the complete set.

Q: What are the key keywords?

A: Foldability, low temperature, flexibility, roofing sheets, waterproofing membranes, polymeric sheets, thermoplastic, elastomer, test method, EN 495, sampling, specimen conditioning.