Calcium silicate eaves and soffit boards



Nichias’ PRE ECO (EESB), which is part of the calcium silicate board ECOLUX lineup that is made using recycled materials, is a board used for eaves applications.
Eco-friendly attributes have been added to the conventional features of calcium silicate boards.
Ecology and quality will be two factors that become the new standard in calcium silicate boards.

Product Category

Building Materials(For Residential Housing/Non-Residential)Eaves and Soffit BoardsCalcium silicate board


Residential Housing & Non-ResidentialHousing ConstructionBuilding (Non-Residential) Construction


A non-flammable material (non-flammable certification NM-1217)
It is incombustible as it uses a base material made mainly of inorganic raw materials.

Excellent dimensional stability
The material is stable as it is formed of a calcium silicate crystal structure. The change in dimensions due to temperatures and humidity is minimal.

Similar to wood and is easy to machine
Just like wood and plywood, it can be easily used for sawing, nailing, and planing.


Width × length
Tolerance (mm) Bulk density
Bending strength [vertical]
Length change rate
from water absorption [vertical] (%)
Thickness Width, length
5 910 × 1820 ( 3'×6')
(Chamfered longitudinally at two ends)
±0.4 +0
0.70 or more
Less than 0.90
138 or more Note 1 0.15 or less
*This product is intended for installation on detached house eaves with a maximum height of 10 meters. Do not use for eaves with a height of 10 meters or more.
*The thickness is the thickness of the thread part.
*The chamfering is C2 (C2 means cutting out a 2 mm-long isosceles right-angled triangle).
*The standard value of the bending breakage load was revised in April 2020.
Note 1: The test method is as per JIS A 1408 and the value is from implementing the test with test specimen No.3.


Non-flammable certification NM-1217


  • TOMBO is a registered trademark or trademark of NICHIAS Corporation.
  • Name of products with "®" are registered trademarks of NICHIAS Corporation.
  • Name of products with "™" are trademarks of NICHIAS Corporation.