Systems

LTS™

(Laminated Timber System)

Laminated Logs

A traditional construction system made up of glued laminated timber logs. Defined by a very characteristic and easily recognisable architecture, this building system is typical of the Nordic countries, but adapts perfectly to warmer climates.

LTS
Seen as the state of the art in timber construction, the result of its own know-how and lifestyle, this construction method consists of stacking logs (straight or rounded on the outside) through a system of fittings to form load-bearing walls. The wood, visible on the outside and inside of the building, offers excellent natural insulation with hygrometric control properties and provides warmth and comfort to its inhabitants. Wood brings the intimacy and tranquillity of nature into the home. It influences the human psyche and reduces stress, just as nature does. Designed, studied and analysed, the houses are machined piece by piece in the factory and joined together, both longitudinally with mechanical fixings, and vertically through structural uprights, forming self-supporting panels that make up the entire walls.
A LTS™ house is usually built on a concrete slab, on the ground or on a crawl space allowing a survey of the construction of 20 cm above the level of the ground. A band of peripheral insulate prevents the capillary rise in the walls.
Structure

The LTS™ house is made up of a stack of glued laminated timber logs, 80 to 160mm thick, with a flat or rounded outer face. The timber pieces are stacked using a longitudinal interlocking system to form load-bearing walls, intersecting at the angles with timber uprights to consolidate and brace the construction.

Watertightness

Airtightness and internal water vapour tightness

In each fitting area, a linen fibre felt or sealing strip ensures watertightness between each part of the construction. Due to its insulating properties, wood prevents the creation of dew points that are detrimental to the building's durability.
The water vapour inside the building is regulated thanks to the hygroscopic properties of wood.

Bracing

Insulation

The LTS™ house is naturally insulated, however, a supplement of Exterior Thermal Insulation (ITE) or Interior Thermal Insulation (ITI) can be applied, depending on the type of climate.

External cladding

Glued laminated timber logs are generally left visible on the outside, with the possibility of applying a perspirant outer coating.

Internal lining

As on the outside, glued laminated timber logs are generally visible on the inside, with the possibility of applying a perspirant varnish. A wooden lining or other materials such as plaster, stone, etc. can be applied as a finish.

External wall - 160mm section: LTS 160 R
External wall - 160mm section: LTS 160 B
External wall - 180mm section: LTS 180
Axonometry external wall - 160mm section: LTS 160 R
Axonometry external wall - 160mm section: LTS 160 B
Axonometry external wall- 180mm section: LTS 180
Internal wall - 80mm section: LTS 80

The evaluation of the LTS™ kit according to the Basic Work Requirements (BWR) was carried out in accordance with EAD 340308-00-0203. The characteristics of the components must correspond to the respective values established in the technical documentation of ETA 18/0984 of ETA 24/0070, verified by Itecons.

The LTS™ system is made up of differentiated elements with the following characteristics:

Designation

Applying

Performance

Result

Standard

LTS160B

External walls

Watertightness

Façade = class E750

Corner = class E1350

EN 12208



Air permeability

Façade = class 4

Corner = class 4

EN 12208



Sound insulation index for airborne sounds

Rw = 35 dB

EN ISO 10140-2:2021

EN ISO 717-1:2020



Thermal resistance and thermal transmittance

U = 0,53 W(m2·K)

EN ISO 6946:2107

EN ISO 10211:2107

LTS180

External walls

Watertightness

Façade = class E1350

Corner = class 7A

EN 12208



Air permeability

Façade = class 4

Corner = class 4

EN 12208



Thermal resistance and thermal transmittance

U = 0,47 W(m2·K)

EN ISO 6946:2107

EN ISO 10211:2107

LTSInterior / exterior componentsDurability

Interior = class 1

Exterior = class 2, 3

EN 335

NATURLAM
R230 ISOL 160

Roof covering

Thermal resistance and thermal transmittance

Upward flow = RT = 4.62 m2K/W

Downward flow = RT = 4.69 m2K/W

EN ISO 6946

EN ISO 10211

CRIPTOLAM F210

Flooring slab

Weighted apparent noise reduction index

Rw = 53 dB

EN ISO 10140-1, 2, 4 and ISO 717-1:2020



Impact sound insulation

Ln,w = 59 dB

EN ISO 10140-1, 2, 3 and 4, EN ISO 717-1 y 2



Thermal resistance and thermal transmittance

Upward flow = RT = 4.15 m2K/W

Downward flow = RT = 4.32 m2K/W

EN ISO 6946

EN ISO 10211

Source: Itecons

Acoustic performances

Sound insulation index: Determination of the sound insulation index to airborne sounds Rw. Range: Rw≤72dB LTS 160 - ITeCons
Determination of the insulation index to percussive conduction sounds CRIPTOLAM F210 - ITeCons
Determining the sound insulation index for airborne sounds CRIPTOLAM F210 - ITeCons
Sound insulation index: Determination of the insulation index to percussive conduction sounds, Ln,w. Range: Ln,w ≥ 25 dB CRIPTOLAM F210 - ITeCons
Sound insulation index: Determination of the sound insulation index to airborne sounds Rw. Range: Rw≤72dB CRIPTOLAM F210 - ITeCons

ETA

European Technical Assessment ETA 24/0070 EUROPEAN TECHNICAL ASSESSMENT - ETA 24/0070 for the construction product LTS (Laminated Timber System) - ITeCons

Permeability & watertightness

Determination of air permeability and watertightness of log walls LTS 160B - ITeCons
Determination of air permeability and watertightness of log walls LTS 180 - corner - ITeCons
Determination of air permeability and watertightness of log walls LTS 160B - corner - ITeCons
Determination of air permeability and watertightness of log walls LTS 180 - ITeCons

Seismic performances

SERIES Timber Buildings SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN SYNERGIES – SEISMIC PERFORMANCE OF MULTI-STOREY TIMBER BUILDINGS Rusticasa building – Final Report – SERIES

Technical assessments

ANNEX 1 - Numerical modelling of CRIPTOLAM F210 and ISOLAM R230 panels – TecMinho
Experimental evaluation of the ISOLAM W180 unit and numerical modelling of the CRIPTOLAM F210 and ISOLAM R230 panels. - TecMinho

Thermal efficiency

Determination of thermal resistance and thermal transmission coefficient of ‘Laminated Timber System – LTS 160’ construction elements - ITeCons
Determination of thermal resistance and thermal transmission coefficient of ‘Laminated Timber System – LTS 180’ construction elements - ITeCons
Determination of thermal resistance and thermal transmission coefficient “ISOLAM R230” panel - ITeCons
Determination of thermal resistance and thermal transmission coefficient “CRIPTOLAM F210” panel - ITeCons
THERMAL CONDUCTIVITY: Determination of the thermal conductivity of wood sections of Japanese Cryptomeria - LNEC
THERMAL CONDUCTIVITY: Determination of the thermal conductivity of sections of Picea Abies (Spruce) wood - LNEC
SPECIFIC HEAT OF WOOD: Experimental determination of the specific heat of Japanese Cryptomeria wood - ITeCons
Determination of thermal resistance and thermal transmission coefficient “CRIPTOLAM F210 – 2025” panel - ITeCons
Determination of thermal resistance and thermal transmission coefficient “NATURLAM R230” panel - ITeCons

Vapour transmission

Water vapour transmission properties: Determination of water vapour transmission properties (Test method: ISO 12572:2016) / Cryptomeria + External wood stain - ITeCons
Water vapour transmission properties: Determination of water vapour transmission properties (Test method: ISO 12572:2016) / Cryptomeria + OTADUY IGUALAK IL-201 - ITeCons
Water vapour transmission properties: Determination of water vapour transmission properties (Test method: ISO 12572:2016) / Cryptomeria + IRUFIRE REAL INTEGRAL - ITeCons
Water vapour transmission properties: Determination of water vapour transmission properties (Test method: ISO 12572:2016) / Cryptomeria - ITeCons

See Other systems

ITS ™

(Laminated Timber System)

Insulated Logs

TFS ™

(Laminated Timber System)

Timber Frame

HTS ™

(Laminated Timber System)

Hybrid System