EN   EN 
 
 
 EUROPEAN  
COMMISSION   
Brussels, XXX   
[…](2023) XXX  draft  
ANNEX  
 
ANNEX  
to the  
Commission Delegated Regulation (EU) …/... of XXX  
 
on the conditions for classification, without testing, of solid wood panelling and cladding 
with regard to their reaction to fire and amending Decision 2006/213/EC     
    
  EN 1  EN ANNEX  
 
Product (11) Product detail 
(5) Minimum mean 
density (6) 
(kg/m3) Minimum 
thicknesses, 
total/ minimum 
(7) (mm)  End-use 
condition (4) Class (3) 
Panelling and 
cladding (1) Untreated wood 
pieces with or 
without tongue 
and groove and 
with or without 
profiled surface  390 9/6 Without air gap 
or with closed 
air gap behind  D - s2, d2  
12/8 D - s2, d0  
Panelling and 
cladding (2) Untreated wood 
pieces with or 
without tongue 
and groove and 
with or without 
profiled surface  390 9/6 With open air 
gap ≤ 20 mm 
behind  D - s2, d0  
18/12  Without air gap 
or with open air 
gap behind  
Wood ribbon 
elements (8) Untreated wood 
pieces mounted 
on a support 
frame (9) 390 18 Surrounded by 
open air on all 
sides (10) D - s2, d0  
(1) Mounted mechanically on a wood batten support frame, with the gap closed or filled with a substrate of at least class A2 - 
s1, d0 with minimum density of 10 kg/m3 or filled w ith a substrate of cellulose insulation material of at least class E and with 
or without a vapour barrier behind. The wood product shall be designed to be mounted without open joints.  
(2) Mounted mechanically on a wood batten support frame, with or without  an open air gap behind. The wood product shall 
be designed to be mounted without open joints.  
(3) Class as  provided for in Table 1 of Annex to Commission Delegated Regulation (EU) 2016/364.  
(4) An open air gap may include possibility for ventilation behind the product, while a closed air gap will exclude such 
ventilation. The substrate behind the air gap must be of at least class A2 - s1, d0 with a minimum density of 10 kg/m3. Behind 
a closed air gap of maximum 20 mm and with vertical wood pieces, the  substrate may be of at least class D - s2, d0.  
(5) Joints include all types of joints e.g. , butt joints and tongue and groove joints ; Untreated wood is a wooden material that 
was not coated and was not su bject to  any kind of treatment other than kiln dryi ng (physical, chemical, impregnation , or other  
treatments ). 
(6) Conditioned according to EN 13238.  
(7) As illustrated in Figure a. Profiled area of the exposed side of the panel not more than 20 % of the plane area, or 25 % if  
measured at both exposed and unexposed side of the panel. For butt joints, the larger thickness applies at the joint interface.  
(8) Rectangular wood pieces, with or without rounded corners, mounted horizontally or vertically on a support frame and 
surrounded by air on all sides, mainl y used close to other building elements, both in interior and exterior applications.  
(9) Maximum exposed area (all sides of rectangular wood pieces and wood support frame) not more than 110 % of the total 
plane area, see Figure b.  
(10) Other building elements closer than 100 mm from the wood ribbon element (excluding its support frame) must be of at 
least class A2 - s1, d0, at distances 100 - 300 mm of at least class B - s1, d0 and at distances more than 300 mm of at least 
class D - s2, d0.  
(11) Applies also to stairs.  
  EN 2  EN Figure a  
 
Profiles for solid wood panelling and cladding  
 
 
 
Figure b  
 
Maximum exposed area of wood ribbon element 2n (t + w) + a ≤ 1,10  
 
 
 
 n = number of wood pieces per meter  
 t = thickness of each wood piece, in meter  
 w = width of each wood piece, in meter  
 a = exposed area of wood support frame (if any), in m2, per m2 of wood ribbon element