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Description
Mercia 5m x 4m(D) Insulated Garden RoomThe 5m x 4m Mercia Insulated Garden Room offers a year round, versatile space with premium Eco quilt insulation in walls, roof, and floor. Its triple layer walls and double glazed argon filled windows provide excellent heat retention and noise reduction. The durable EPDM rubber roof ensures weather protection. Made in the UK from sustainable timber, this garden room is fully installed and usually requires no planning permission due to its sub 2. 5m
The 5m x 4m Mercia Insulated Garden Room offers a year-round, versatile space with premium Eco-quilt insulation in walls, roof, and floor. Its triple-layer walls and double-glazed argon-filled windows provide excellent heat retention and noise reduction. The durable EPDM rubber roof ensures weather protection. Made in the UK from sustainable timber, this garden room is fully installed and usually requires no planning permission due to its sub-2.5m height.
Key Features
- Spacious 5m x 4m insulated garden room for versatile all-season use
- Triple-layer walls with 44mm Eco-quilt insulation for superior thermal efficiency
- Double-glazed, argon-filled windows to retain warmth and reduce noise
- Insulated roof and floor constructed with 16mm tongue & groove cladding
- Weather-resistant EPDM rubber roof membrane by Firestone
- Manufactured in the UK using sustainably sourced timber
- Fully installed by professional installers included in price
- Under 2.5m height, generally no planning permission required*
*Please verify with your local authority
Specifications
| Feature | Details |
|---|---|
| Imperial Size | 15 x 13 ft |
| Metric Size | 5 x 4 m |
| Treatment Type | Untreated |
| People Required | Fully Fitted (Installation Included) |
| Guarantee | 10 Years (with annual treatment) |
| Cladding | Shiplap+ |
| Cladding Material | 16mm Shiplap+ Tongue & Groove |
| Roof Material | OSB & 12mm Matchboard |
| Floor Material | 16mm Matchboard |
| Roof Type | Flat Roof |
| Roof Covering | EPDM Rubber (Firestone) |
| Door Style | Double Door |
| Building Type | Garden Room |
| Width | 16' 11" / 5.16 m |
| Depth | 15' 10" / 4.83 m |
| Internal Width | 16' 4" / 5.0 m |
| Internal Depth | 13' 1" / 4.0 m |
| Floor Width | 16' 10" / 5.13 m |
| Floor Depth | 13' 6" / 4.11 m |
| Under 25m² | Yes |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
Works once again!
Size: Compact Car, Mid-size Sedan
Third time using TireJect on a vehicle, and it's worked perfectly each time. First was the off-road formula for leaking motorcycle tire beads.... then this formula my light SUV with a slow leak until I could get the tire replaced. This was for a stubborn tire that had a leak SOMEWHERE, and usually would lose 10-15 psi overnight after a fill-up. Two days later, still fully inflated and no signs of trouble. This is great because this formulation is also okay for tire pressure sensors. Will continue to purchase this product for similar issues going forward. High quality, durability, and easy to use.
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Reviewed in the United States on October 29, 2025
★★★★★ 5
Works like a champ!
Size: Full-size Truck, SUV
It works great! I had one fairly slow leak and 2 very slow leaks. 3 Tires. 2 were on my 94 Ford Ranger. I put a little more than 1/2 the packet in my fastest leaking tire (on the Ranger) and about 1/4 of the packet in the 2nd tire of the same vehicle. Lastly, I put the final 1/4 in a very slow leaking tire on my 2000 Ford F-150. All tires have stopped leaking!! I am delighted with the effectiveness of this product!!
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Reviewed in the United States on May 13, 2026
★★★★★ 4
Seems to have done a great job.
Size: Full-size Truck, SUV (2-pack)
One of our cars has suffered from rim leaks and was driving me nuts. Constantly being asked by my wife to top off the tires on her car. When I replaced a damaged rim I asked the tire shop to look for the source of the leaks. They said the "alloy" rims had started to corrode and did their best to get them to seal but warned me they would likely leak again. This spring when I removed her snow tires I found 3 of her 4 tires had gone completely flat in storage. The fourth was the new rim which was fine. I considered buying new rims that won't have this problem but wanted to wait until her times need to be replaced. The batteries in the TPMS sensors are getting very low so likely these will need to be replaced as well. I thought to try some sort of sealant. Most of the products I saw were not rated for automotive systems and offered warnings about risk to the TMPS sensors. This seemed to be the only product rated for my application and claimed it would not harm our car's sensors. So I gave it a shot. I ordered the SUV package that came with an injector and two 8-oz bottles. I put 4 oz in each tire per the instructions. Overall the process was easy except the valve core extractor broken on one of the tires. I had to pick up a replacement at a local auto parts store. Also, injecting the sealant creates a small amount of pressure in the tire that, if one doesn't release by drawing out the plunger, will burp a small amount of sealant onto the rims. Fairly easy to clean up with WARM water and easier to avoid after the first experience. Drove the car around at a variety of speeds for 10-15 minutes (had errands to run) and waited to see what happened. Great results. Weeks later and the tires still have the correct pressure. I am not sure how long this will last but hopefully for the remaining life of the tires at least. I took one star off for easy of use / easy to install because the valve core extractor is made of extremely cheap aluminum and I am sure others will have a poor experience with it. Be forewarned and consider buying one before you start jacking up your car and letting the air out of the tires only to find you break the tool on a sticky valve core and are unable to complete the job without a trip to the auto parts store. I'll update this review in about a year to report on the long-term outlook for this product.
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Reviewed in the United States on June 20, 2023
★★★★★ 5
It Works!
Size: Full-size Truck, SUV
When I bought my vehicle it didn't come with a spare. I knew what I was in for. I was on my way to an important meeting and as fate would have, the tire pressure indicator reported a flat. I imagined the worst but experienced the best!
The directions said to let all the air out of tire and remove the valve stem core, it seemed like I was making a bad situation worse. Then it said to attach the tube to the stem and squeeze the contents into the tire. I thought "this is never going to work" the fluid seemed too watery to seal anything, but I followed instructions, I reinstalled the valve core and reinflated the tire, and it worked!
I expected it to leak immediately, it didn't. It lasted all day and most of the next day until I could get the tire to the shop. They removed a nail and patched the hole, overall I'm very satisfied, I bought a replacement right away, just in case!
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Better than the green goo
Size: Full-size Truck, SUV (2-pack)
Recently, while I was at work, I noticed that I had at some point run over a nail with my car. Normally, you'd take your car to the tire shop and let them plug the hole for you. Well, the only problem was that the nail decided that it was going to poke my tire where the sidewall meets the tread, and most shops will refuse to plug a tire when it's punctured there. Makes sense, it's a liability issue for them, so I can't blame them. That still leaves me with the problem of having a tire with a nail in it. So, I could either replace the tire with either a new or used tire, which is expensive or I can try using a sealant to try and get as many miles out of my tire as I can.
In the past, I had tried using the green goo sealant on nail holes, and while it works to get you 15 miles down the road, that's about it. Now, while TireJect doesn't recommend using their product on punctures on the shoulder of the tire, I decided that I'd give it a try to see if it would work. And as of writing this review, it's been about 10 days since I put TireJect in my tire, and so far, it hasn't leaked any air, despite it not being meant for the shoulder. When money isn't so tight, I'll probably go ahead and replace the tire, especially since there's only about 4/32 tread depth left, but for the time being, I'll keep running it, and hopefully it keeps holding pressure properly like it has been.
Now, as for how easy it is to use, the only tools you will need that aren't provided, is an air compressor to allow you to re-inflate the tire. The kit comes with everything else you will need, including a valve core removal tool and a syringe to add the sealant to your tire. To use this product, you will first need to carefully remove the valve core with the provided tool, careful not to lose the core, since it doesn't come with a replacement core. After that, thread the hose on the syringe on to your valve stem, and then carefully add the required amount of sealant to the syringe. If you accidentally spill some, wipe it off before it dries, so that it doesn't stain anything. From there, just push the goo into the tire with the plunger, adding more to the syringe as necessary. When you're all done, re-install the valve core into the valve stem snuggly, careful not to over-tighten, and air up the tire to the recommended PSI with your compressor. After all that is done, go take a short, slow drive to distribute the sealant, and then recheck your air pressure.
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Reviewed in the United States on July 29, 2025
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