Hello!
I am soon going to build a sunroom on an existing patio. The decking timber is 28 x 120. Now I have some thoughts about how to handle the "foundation" for the walls. I'm thinking of attaching a frame consisting of IMP 45 x 170, which of course is laid with the broad side against the decking, upon which I will build the outer and inner walls plus insulation.
Here are my questions about this:
I assume that it should be IMP wood since the foundation will be exposed to some moisture.
On the beam 45 x 170, the laminated timber posts are attached. Here I'm wondering if I should have protective paper and/or protective paint between the beam and the posts to minimize the risk of moisture traveling through the beams and into the posts?
Screws to attach the beams to the decking with, any tips? As narrow as possible?
Last but not least, I wonder if this is the best solution overall?
Best regards.
/ Hans
I am soon going to build a sunroom on an existing patio. The decking timber is 28 x 120. Now I have some thoughts about how to handle the "foundation" for the walls. I'm thinking of attaching a frame consisting of IMP 45 x 170, which of course is laid with the broad side against the decking, upon which I will build the outer and inner walls plus insulation.
Here are my questions about this:
I assume that it should be IMP wood since the foundation will be exposed to some moisture.
On the beam 45 x 170, the laminated timber posts are attached. Here I'm wondering if I should have protective paper and/or protective paint between the beam and the posts to minimize the risk of moisture traveling through the beams and into the posts?
Screws to attach the beams to the decking with, any tips? As narrow as possible?
Last but not least, I wonder if this is the best solution overall?
Best regards.
/ Hans
No expert who can spare a few minutes for tips?E Elknuffo said:Hello!
I am about to build a conservatory on an existing patio. The decking is 28 x 120. Now I have some thoughts about how to handle the "foundation" for the walls. I am thinking of attaching a frame consisting of IMP 45 x 170, which of course will be laid with the wide side against the decking, on which I will build the outer and inner walls plus insulation.
I have a few questions about this:
I assume it should be IMP wood, as the foundation will be exposed to some moisture.
The laminated wooden posts will be attached to the 45 x 170 beam. Here, I'm wondering if I should have protective paper and/or protective paint between the beam and the posts to minimize the risk of moisture traveling through the beams into the posts?
Screws to attach the beams to the decking, any tips? As slim as possible?
Last but not least, is this the best solution overall?
Best regards.
/ Hans
Your questions invite a lot of follow-up questions!
What do you have under the decking? You need correctly dimensioned support points for the walls in the underlying construction.
Is it a standalone conservatory or adjoining the house? What does the rest of the construction look like? You mentioned glue-laminated timber? Wall and roof cladding? Are you planning to insulate the walls and roof but not the floor?
Generally a bad idea to use pressure-treated wood in a living environment. If it's an insulated or at least weather-protected room, I would cut away the decking and build conventionally with joists, walls, and roof in construction timber (not pressure-treated).
What do you have under the decking? You need correctly dimensioned support points for the walls in the underlying construction.
Is it a standalone conservatory or adjoining the house? What does the rest of the construction look like? You mentioned glue-laminated timber? Wall and roof cladding? Are you planning to insulate the walls and roof but not the floor?
Generally a bad idea to use pressure-treated wood in a living environment. If it's an insulated or at least weather-protected room, I would cut away the decking and build conventionally with joists, walls, and roof in construction timber (not pressure-treated).
Hello Jalmars!
Thank you for your response (and questions).
I apologize if I left out any info. Here's the situation...
I have a building permit for the sunroom. This means the authorities know the conditions and have approved the construction. I used Svenskt Trä's program for the dimensioning. The framework (studs/pier foundation) of the patio was done by professionals; I installed the decking myself. You can absolutely get more info from me if you want, but given the building permit, I feel I am "covered."
Regarding the treated wood, yes, I am aware of the discussion. I know it's not ideal, but treated wood today is more "friendly," so to speak. We also know many people in our circle who have treated wood in their sunroom. But thank you anyway!
The construction overall will include both glulam and structural timber. It will be built adjoining the house.
But back to my question then, Jalmars; what type of wood should I choose for the base of the walls, considering the risk of moisture?
Kind regards
Thank you for your response (and questions).
I apologize if I left out any info. Here's the situation...
I have a building permit for the sunroom. This means the authorities know the conditions and have approved the construction. I used Svenskt Trä's program for the dimensioning. The framework (studs/pier foundation) of the patio was done by professionals; I installed the decking myself. You can absolutely get more info from me if you want, but given the building permit, I feel I am "covered."
Regarding the treated wood, yes, I am aware of the discussion. I know it's not ideal, but treated wood today is more "friendly," so to speak. We also know many people in our circle who have treated wood in their sunroom. But thank you anyway!
The construction overall will include both glulam and structural timber. It will be built adjoining the house.
But back to my question then, Jalmars; what type of wood should I choose for the base of the walls, considering the risk of moisture?
Kind regards
I've observed that some encounter problems with sliding doors due to movements in the foundation (deck) when they've built conservatories on the decking.E Elknuffo said:Hi Jalmars!
Thanks for your response (and questions).
Apologies if I left out any info. Here's the situation...
I have building permits for the conservatory. This means the authorities know the conditions and have approved the construction. I worked out the dimensions using the Svenskt Trä's program. The framework (joists/pile casting) on the patio was done by professionals, I installed the decking myself. You can absolutely get more info from me if you want, but with the permit, I feel like I'm "covered."
Regarding the fact that it's pressure-treated wood, yes, I'm aware of that discussion. I know it's not ideal, but that today's pressure-treated wood is "friendlier," so to speak. We also know many in our circle who have pressure-treated wood in their conservatories. But thanks anyway!
The overall construction will include both glulam and structural timber. It's being built adjacent to the house.
But back to my question then, Jalmars; what type of timber should I choose as the lower plate in the walls? And I'm thinking about the risk of moisture.
Best regards
But if the foundation is well constructed so that it doesn't move, then there shouldn't be any problem.
I would follow your approach and place tar paper between the sill plate and the wall studs to reduce the risk of moisture in the wall studs.
An idea I had when reading your question was to place a pressure-treated 45x170 against the decking, tar paper, and then a regular 45x170 on top of that, reducing the risk of moisture transfer between the pressure-treated 45x170 and the rest of the wall structure and providing a more stable sill for the walls.
Perhaps a bit of belt and braces, but the additional cost is probably manageable.
Thanks wildeside
Regarding the sliding doors and the risk of movement on the decking, I've read somewhere on this forum that you can break up the decking and add an extra support beam right where the sliding door will be. For increased stability. We'll see if I do that. However, it's a solid foundational construction...
Great tip about the base for the walls! I am a "belt and suspenders man," so it suits me perfectly!
Best regards.
Regarding the sliding doors and the risk of movement on the decking, I've read somewhere on this forum that you can break up the decking and add an extra support beam right where the sliding door will be. For increased stability. We'll see if I do that. However, it's a solid foundational construction...
Great tip about the base for the walls! I am a "belt and suspenders man," so it suits me perfectly!
Best regards.