Imperpuma Plus PY4/G

1 m x 10 m x 4 Kg / m2 sheet of modified bitumen with plastometer (APP), with polyester felt reinforcement, finished with non-stick polyethylene film on the inner side and with mineral granule as protective material on the outer side. It acts as a mono-layer and bilayer system under heavy protection. Suitable in turn for tightness in buried structures and bottom sheet in landscaped roof. 

Download technical data sheet

Additional information


Made of a non-woven polyester felt reinforcement, modified with plastometer mastic and finish with a non-stick polyethylene film on both sides. 

Features and applications

  • Mono-layer systems under heavy protection. 
  • Bilayer system under heavy protection. 
  • Bottom sheet in bilayer system exposed to open sky. 
  • Sheet for tightness in buried structures. 
  • Bottom sheet in landscaped roof. 

Instructions for use

Place by adhesion using a blow torch. 

Cautions and recommendations

  • Not recommended as top sheet in bilayer system exposed to the open sky, mono-layer exposed to open sky and top sheet in landscaped roof. 
  • Store in an upright position. 
  • Store away from open sky and humidity. 
  • Do not apply at temperatures below - 5 ° C. 
  • In general, the implementation of the waterproofing protection will be carried out as soon as possible, especially in non-adhered solutions, for which it is recommended not  to have for more than 72h under open sky. 


They are sold in 25 rolls per pallet. Maximum storage time: 2 years, away from open sky at temperatures above + 5ºC. 

Technical data

External Fire Behavior prEN 13501-5 - Broof(t1)
Reaction to fire EN 13501-1 - E
Watertightness EN 1928 (A) - Pass
Longitudinal Traction Resistance EN 12311-1 N/50 mm 700±200
Transversal Traction Resistance EN 12311-1 N/50 mm 450±150
Longitudinal elongation at breakpoint EN 12311-1 % 35±15
Transversal elongation at breakpoint EN 12311-1 % 35±15
Root penetration resistance prEN 13948 - PND
Static load resistance EN 12730 Kg ≥ 15
Impact resistance EN 12691 mm ≥ 1000
Joint resistance to longitudinal shear EN 12317-1 N/5 cm NA
Joint resistance to transversal shear EN 12317-1 N/5 cm NA
Foldability EN 1109 ºC ≤ -15
Water vapor transmission EN 1931 (m².s.Pa)/Kg 20.000
Creep resistance EN 1110 ºC ≥120
Dimensional stability EN 1107-1 % ≤ 0.4
Adhesion of granules EN 12039 % PND
Hazardous substances - - PND

PND: No Performance Determined; It passes: Positive; It does not pass: Negative 

Visible defects EN 1850-1 - Faultless
Mass EN 1849-1 Kg/m² [3.80-4.40]
Length EN 1848-1 m 10
Width EN 1848-1 m 1
Straightness EN 1848-1 - Pass
Roll surface area - 10
Rolls per pallet - - 25



The instructions for use are given according to our tests and knowledge and do not imply any commitment by GRUPO PUMA nor free the consumer from the examination and verification of the products for their correct use. Claims must be accompanied by the original packaging to allow a proper traceability.

GRUPO PUMA is not responsible, in any case, for the application of its products or constructive solutions carried out by the application company or other parties involved in the process and / or execution of the work, limiting the responsibility of GRUPO PUMA exclusively to the damages directly attributable to the supplied products, individually or integrated in systems, due to failures in their manufacturing process.

In any case, the drafter of the work project, the technical management or the person responsible for the work, or collaterally the application company or other parties involved in the process and / or execution of the work, must ensure the suitability of the products addressing the characteristics of them, as well as the conditions, support and possible pathologies of the work in question.

The values obtained by GRUPO PUMAS's products or its constructive solutions that, as the case may be, are determined by the EN standards or any other regulation that applies to it in each case refers exclusively to the conditions specifically stipulated in said regulation and that are referred to, among others, to certain characteristics of the support, humidity and temperature conditions, etc. without being them required in the tests obtained under different conditions, all in accordance with the relevant regulation.