Where Wooden Houses Lose Heat<\/h2>\n\n\n\n
Spruce offers far better natural insulation than masonry, but timber alone cannot do all the heavy lifting. Its thermal conductivity sits at roughly 0.13 W\/m\u00b7K (according to the Thermtest database), compared to 1.6 W\/m\u00b7K for standard concrete and 0.033\u20130.040 W\/m\u00b7K for mineral wool. A solid 70 mm timber wall delivers a thermal resistance (R-value) of about 0.54 m\u00b2K\/W. Data from Calculytic indicates that windows account for 25% to 35% of transmission heat loss, while uninsulated roofs represent 15% to 25%.<\/p>\n\n\n\n
To see the real-world impact, consider a 5 \u00d7 4 m cabin with 34 m\u00b2 of net wall area, 22 m\u00b2 of roof area, and 6 m\u00b2 of standard double glazing (U = 2.7 W\/m\u00b2K). Excluding floor transmission, air infiltration, and thermal bridges, the figures speak for themselves:<\/p>\n\n\n\n
- \n
- Uninsulated baseline:<\/strong> The walls (U \u2248 1.4) lose 48 W\/K, an 18 mm board timber roof (U \u2248 3.6) loses 79 W\/K, and the glazing loses 16 W\/K. That is a total heat loss of 143 W\/K\u2014translating to roughly 2.1 kW of continuous heating required to maintain a 15 \u00b0C temperature difference between inside and outside.<\/li>\n
- Roof insulated with 30 mm rigid boards:<\/strong> The roof\u2019s U-value drops to \u2248 0.6 (13 W\/K). Overall heat loss falls to 77 W\/K\u2014an instant 46% reduction<\/strong>.<\/li>\n
- Roof plus walls insulated with 100 mm mineral wool:<\/strong> Wall performance improves to U \u2248 0.28 (10 W\/K). Total heat loss drops to 39 W\/K\u2014a 73% total reduction<\/strong>. At this stage, the windows become the primary escape route, making up 41% of remaining heat loss.<\/li>\n<\/ul>\n\n\n\n
This is why glazing specifications matter. According to Open University research, upgrading standard double glazing to low-emissivity (low-E) glass drops the unit’s U-value from 2.7 down to between 1.7 and 2.0 W\/m\u00b2K.<\/p>\n\n\n\n
Want to use your cabin 365 days a year?<\/h3>\n\n\n\n
Skip the retrofitting by choosing a factory-insulated model. These buildings arrive ready for year-round living, equipped with 30 mm PIR floor and roof boards and 100 mm wall insulation\u2014with installation included.<\/p>\n\n\n\n
\ud83c\udfe0 View insulated cabins<\/b><\/a><\/p>\n\n\n\n\n
Direct from the manufacturer with 20+ years of experience and a 5-year warranty.<\/em><\/p>\n\n\n\n
- \n
- \n\t\n\t\t\n\t
![\"Barbados](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/09\/ChatGPT-Image-Sep-8-2026-11_29_53-AM-1-600x400.jpg\")
<\/div>\n Barbados Fully Insulated Garden Room with Thermo Wood Cladding \u2013 21 m\u00b2 \/ 6 \u00d7 4 m<\/h2>\n\t21.450,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li>- \n\t
\n\t\t\n\t![\"Fully](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/09\/ChatGPT-Image-Sep-8-2026-12_02_15-PM-1-1-600x400.jpg\")
<\/div>\n Fully Insulated Model A Wooden Garden Building with Thermo Wood Cladding \u2013 30 m\u00b2 \/ 8 \u00d7 4 m<\/h2>\n\t32.870,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li>- \n\t
\n\t\t\n\t![\"Fully](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/08\/ChatGPT-Image-Sep-9-2026-12_22_14-PM-3-600x400.jpg\")
<\/div>\n Fully Insulated Ryan Garden Room with Thermo Wood Cladding \u2013 14 m\u00b2 \/ 5 \u00d7 3 m<\/h2>\n\t17.880,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li><\/ul>\n<\/div>\n\n\n\nThermal Insulation Kits from Casetas de Jard\u00edn 24<\/h2>\n\n\n\n
Standard log cabins are traditionally designed for seasonal use, but a modest insulation upgrade easily transforms them into comfortable spaces year-round. Fitting insulation during initial construction is substantially faster, easier, and cheaper than retrofitting it down the road.<\/p>\n\n\n\n
Our cabin thermal insulation kit<\/a> is designed for straightforward assembly and includes all the necessary materials and fixings to insulate both the roof and the floor. The roof boards install directly over the tongue-and-groove roof planks, followed by an OSB deck that receives bitumen shingles, roofing felt, or an alternative waterproofing system. You can add these finishes directly to your order or source them locally; check each cabin’s product page for available options.<\/p>\n\n\n\n
Insulating both the roof and the floor enables true four-season comfort. Combined with a small air-source heat pump, the building will remain effortlessly warm through freezing winters and pleasantly cool on scorching summer afternoons. By blocking intense solar radiation from baking the roof, the insulation works just as hard in July as it does in January.<\/p>\n\n\n\n
The rigid foam boards feature a low-emissivity aluminium facing, eliminating thermal bridging and maximising heat retention to keep running costs to an absolute minimum.<\/p>\n\n\n\n
How to Insulate the Roof<\/h3>\n\n\n\n
The roof kit includes 30 mm rigid insulation boards and 11 mm OSB panels (always consult your model’s specific product sheet for dimensions). Lay the insulation boards directly onto the timber roof boards, working upwards from the eaves. Cover the full roof surface, trimming the ridge boards flush and leaving no gaps between panels.<\/p>\n\n\n\n
Next, place the OSB panels over the insulation and screw them down, inserting one screw in each corner and one in the centre of every panel. Finally, apply your chosen waterproof roof covering. We recommend self-adhesive Icopal bitumen shingles for pitched roofs, or heavy-duty self-adhesive Firesmart roofing felt for pent and flat roofs.<\/p>\n\n\n\n
![\"Cabin](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/10\/aislamiento-termico-techo-7bb731d68ad3.webp\")
<\/figure>\n\n\n\n- \n
- Roof boards<\/li>\n
- Rigid insulation boards<\/li>\n
- OSB panels<\/li>\n
- Roofing shingles \/ felt<\/li>\n<\/ul>\n\n\n\n
How to Insulate the Floor<\/h3>\n\n\n\n
The floor kit uses 30 mm rigid insulation panels supported by screws or metal brackets set inside the foundation joists. First, drive screws or attach small L-brackets along the inner faces of the joists, roughly 30 mm below the top edge. Cut the insulation boards to size so they wedge snugly between the joists, rest them on your supports, and then lay the timber floorboards on top.<\/p>\n\n\n\n
Place support screws every 30 cm along both sides of each joist. The insulation should sit tightly by friction alone; the screws simply act as stops to prevent the boards from dropping under floor loads over time.<\/p>\n\n\n\n
Insulating the floor and roof on a building of 20 m\u00b2 or more takes approximately four to five hours, depending on roof geometry. For year-round use, it is one of the most cost-effective upgrades you can make. For step-by-step guidance, consult our in-depth walkthrough on how to insulate your cabin’s roof and floor<\/a>.<\/p>\n\n\n\n
![\"Cabin](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/10\/aislamiento-termico-suelo-d300a555cc8e.webp\")
<\/figure>\n\n\n\n- \n
- Foundation joists<\/li>\n
- Support screws \/ brackets<\/li>\n
- Rigid insulation boards<\/li>\n
- Floorboards<\/li>\n<\/ul>\n\n\n\n
Walls: When Is Insulation Actually Necessary?<\/h2>\n\n\n\n
Wall insulation requirements come down to log thickness and how you plan to use the space. Basic tool sheds typically use 19 mm to 28 mm timber, whereas habitable spaces\u2014such as home offices, guest rooms, or annexes\u2014demand wall thicknesses between 40 mm and 92 mm. A 44 mm wall is generally sufficient for comfortable three-season use once the roof and floor are insulated.<\/p>\n\n\n\n
However, if you plan to live year-round in a wooden house<\/a> built with 70 mm or 88 mm logs, exterior wall insulation is well worth the investment. In a recent golf simulator studio we installed in Madrid, the client specified 100 mm of mineral wool clad in external timber rainscreen panels. To fit this setup yourself, explore our dedicated wall insulation kit<\/a>.<\/p>\n\n\n\n
![\"Interior](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/10\/caseta-de-jardin-con-aislamiento-completo-gimnasio-en-el-jardin-y-gran-terraza-de-madera-termotratada-en-madrid-3-4b7ef083a684.webp\")
<\/figure>\n\n\n\nAvoid thick internal insulation.<\/strong> Studies on solid log construction advise against installing more than 50 mm of mineral wool internally, and they recommend that timber moisture content stay below 12% before installation. Adding insulation externally behind a ventilated cavity keeps the solid logs warm and dry on the building’s interior, eliminating interstitial condensation risks.<\/p>\n\n\n\n
As an architectural benchmark, the Spanish Technical Building Code (CTE) sets maximum thermal transmittance values in climate zone C at 0.49 W\/m\u00b2K for exterior walls and 0.40 W\/m\u00b2K for roofs. While freestanding garden outbuildings are generally exempt from mandatory CTE standards, a log wall upgraded with 100 mm of mineral wool (\u2248 0.28 W\/m\u00b2K) easily surpasses this benchmark, whereas a roof with just 30 mm of insulation (\u2248 0.6 W\/m\u00b2K) falls short. If you are building a permanent dwelling, consider increasing roof insulation thickness accordingly. Before breaking ground, review our complete guide to regulations for installing a wooden house<\/a>.<\/p>\n\n\n\n
Summer Performance: Keeping Heat Out<\/h2>\n\n\n\n
Thermal insulation is just as vital during summer heatwaves. According to IDAE (Spain’s Institute for Energy Diversification and Saving), external shading systems like awnings, louvres, or exterior blinds stop up to 80% of solar radiation before it hits the glass\u2014something standard interior blinds simply cannot do. Make sure to ventilate cross-drafts during the cooler hours of dawn and dusk.<\/p>\n\n\n\n
Roof colour also plays a major role: research conducted by UNED on residential flat roofs in C\u00e1diz demonstrated that replacing a dark membrane with a reflective white “cool roof” lowered cooling energy consumption by 19%.<\/p>\n\n\n\n
Looking for a home built for all seasons?<\/h3>\n\n\n\n
Built with 70 mm or 88 mm timber profiles and fully insulated envelopes, our wooden houses maintain comfortable temperatures year-round with minimal heating costs. Crafted from slow-grown Nordic spruce with premium double glazing throughout.<\/p>\n\n\n\n
\ud83c\udfe0 View wooden houses<\/b><\/a><\/p>\n\n\n\n\n
Direct from the manufacturer: no dealer markups and free delivery included.<\/em><\/p>\n\n\n\n
- \n
- \n\t\n\t\t\n\t
![\"Two-Bedroom](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2024\/09\/2-bedroom-log-cabin-daisy-g0401-01-600x400.jpg\")
<\/div>\n Two-Bedroom Log Cabin Summer House “Daisy” | 70 MM | 10 X 10 M | 73 m\u00b2<\/h2>\n\t46.840,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li>- \n\t
\n\t\t\n\t![\"Casa](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2022\/03\/Casa-de-madera-con-un-dormitorio-Stefan3-600x400.jpg\")
<\/div>\n One Bedroom Timber Cabin Stefan 3 – 27 M2 \/ 7 X 4 M \/ 70 MM<\/h2>\n\t16.270,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li>- \n\t
\n\t\t\n\t![\"Casa](\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2017\/02\/large-log-cabin-holiday-a-G0202-01-600x400.jpg\")
<\/div>\n Log Cabin Hansa Holiday A 58 M2 \/ 13 X 6 M \/ 88 MM<\/h2>\n\t46.670,00€<\/span><\/bdi><\/span><\/span>\n<\/a><\/span>
See Description<\/a><\/div><\/div>\n<\/li><\/ul>\n<\/div>\n\n\n\nCommon Mistakes to Avoid<\/h2>\n\n\n\n
Research from the Building Science Corporation highlights that timber develops surface mould once its moisture content surpasses 16%. Insulation cannot fix a damp substructure, so keep these critical installation pitfalls in mind:<\/p>\n\n\n\n
- \n
- Building on an uneven, poorly drained base:<\/strong> Damp ground draws moisture straight into the bearer joists. Always build on a solid, level, and well-drained foundation.<\/li>\n
- Leaving seams between insulation boards:<\/strong> Even thin gaps create thermal bridges, leading to heat escape and localised condensation.<\/li>\n
- Enclosing damp timber:<\/strong> Trapping moisture behind insulation panels leads to rot and structural decay.<\/li>\n
- Ignoring windows and door seals:<\/strong> Worn or missing draught seals will undo the thermal performance of insulated walls and ceilings.<\/li>\n<\/ul>\n\n\n\n
Once your cabin is assembled and insulated, treat all exterior timber surfaces\u2014along with the interior faces of door frames and window reveals\u2014with a high-grade microporous wood preservative. Pay close attention to the top and bottom edges of door leaves and opening window sashes.<\/p>\n\n\n\n
Keep in mind that heavily insulating a 19 mm to 28 mm storage shed used only for gardening gear rarely makes financial sense. For occasional summer retreats, natural ventilation and external shading are often all you need.<\/p>\n\n\n\n
Ultimately, successful insulation begins where heat escapes fastest: address the roof first, followed by windows, walls, and floors, while maintaining an airtight, moisture-controlled building envelope.<\/p>\n\n\n\n
Frequently Asked Questions<\/h2>\n\n\n\n
Can you insulate a wooden cabin after it has already been assembled?<\/strong>Yes, though insulating during the initial build is far easier and more economical. Retrofitting takes considerably more time, whereas doing it during assembly takes just four to five hours for both the roof and floor on a 20 m\u00b2 building.<\/p> <\/div>
Do the walls of a 70 mm log cabin need extra insulation?<\/strong>If the building will serve as a daily home office, creative studio, or residential annexe, external wall insulation is highly recommended\u2014solid 70 mm spruce provides an R-value of roughly 0.54 m\u00b2K\/W on its own. For extended three-season use, an insulated roof and floor are usually sufficient.<\/p> <\/div> <\/div>\n\n\n\n\n
References<\/h2>\n\n\n\n
- \n
- Thermtest \u2013 Materials Database, spruce wood<\/a><\/li>\n
- BOE \u2013 Real Decreto 732\/2019, CTE DB-HE<\/a><\/li>\n
- Calculytic \u2013 Transmission Heat Losses<\/a><\/li>\n
- Open University \u2013 Energy in buildings: U-values<\/a><\/li>\n
- DiVA \u2013 Performance of interiorly insulated log wall<\/a><\/li>\n
- elEconomista \u2013 Exterior awning vs. interior blind (IDAE)<\/a><\/li>\n
- UNED \u2013 Cool roofs in Spanish residential buildings<\/a><\/li>\n
- Building Science \u2013 Moisture Control for Buildings<\/a><\/li>\n<\/ol>\n\n","protected":false},"excerpt":{"rendered":"
Learn how to insulate a wooden house step by step. Covers roof, floor, and wall insulation, heat loss calculations, common mistakes, and when it pays off.<\/p>\n","protected":false},"author":0,"featured_media":20792,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-20852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sin-categorizar"],"acf":[],"yoast_head":"\n
How to Thermally Insulate a Wooden House: A Data-Backed Guide<\/title>\n<meta name=\"description\" content=\"Learn how to insulate a wooden house step by step. Covers roof, floor, and wall insulation, heat loss calculations, common mistakes, and when it pays off.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/casetasdejardin24.es\/en\/how-to-thermally-insulate-a-wooden-house\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Thermally Insulate a Wooden House: A Data-Backed Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to insulate a wooden house step by step. Covers roof, floor, and wall insulation, heat loss calculations, common mistakes, and when it pays off.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/casetasdejardin24.es\/en\/how-to-thermally-insulate-a-wooden-house\/\" \/>\n<meta property=\"og:site_name\" content=\"Casetas de Jardin 24\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-07T07:40:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/casetasdejardin24.es\/wp-content\/uploads\/2026\/10\/aislamiento-termico-techo-7bb731d68ad3.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"660\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"9 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How to Thermally Insulate a Wooden House: A Data-Backed Guide","description":"Learn how to insulate a wooden house step by step. 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Retrofitting takes considerably more time, whereas doing it during assembly takes just four to five hours for both the roof and floor on a 20 m\u00b2 building.","inLanguage":"en-ES"},"inLanguage":"en-ES"},{"@type":"Question","@id":"https:\/\/casetasdejardin24.es\/en\/how-to-thermally-insulate-a-wooden-house\/#faq-question-be02a21acc76","position":2,"url":"https:\/\/casetasdejardin24.es\/en\/how-to-thermally-insulate-a-wooden-house\/#faq-question-be02a21acc76","name":"Do the walls of a 70 mm log cabin need extra insulation?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"If the building will serve as a daily home office, creative studio, or residential annexe, external wall insulation is highly recommended\u2014solid 70 mm spruce provides an R-value of roughly 0.54 m\u00b2K\/W on its own. For extended three-season use, an insulated roof and floor are usually sufficient.","inLanguage":"en-ES"},"inLanguage":"en-ES"}]}},"_links":{"self":[{"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/posts\/20852","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/comments?post=20852"}],"version-history":[{"count":0,"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/posts\/20852\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/media\/20792"}],"wp:attachment":[{"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/media?parent=20852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/categories?post=20852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casetasdejardin24.es\/en\/wp-json\/wp\/v2\/tags?post=20852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} - BOE \u2013 Real Decreto 732\/2019, CTE DB-HE<\/a><\/li>\n
- Leaving seams between insulation boards:<\/strong> Even thin gaps create thermal bridges, leading to heat escape and localised condensation.<\/li>\n
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- Roof insulated with 30 mm rigid boards:<\/strong> The roof\u2019s U-value drops to \u2248 0.6 (13 W\/K). Overall heat loss falls to 77 W\/K\u2014an instant 46% reduction<\/strong>.<\/li>\n