Using GRP
Using GRP
I'm currently investigating ways to replace the thatched roof on my little thatched cottage. The current roof was bundles of plumbers hemp soaked in waterproof PVA and has lasted several years before the combined effects of weather and birds destroyed it.
I'm wondering ifa GRP one might be a longer term answer, but I don't want to end up with a smooth glossy top surface, so I'm thinking that:
1) laying a chopped strand mat right on top of the resin might work? The problem is that the fibres will run in all random directions, which is the one thing that real thatch doesn't do.
2) I've found this long strand insulation and I'm wondering if it might be possible to comb it out into moree or less parallel strands and lay that on top? ( Yes I know that glass fibres are nasty and I'd need skin and breathing protection). https://www.ebay.co.uk/itm/A-Glass-Long ... 0891458078
I know that there are boat builders etc amongst us, and I wondered if anyone could offer advice on these thoughts or any other suggestions, please?
I'm wondering ifa GRP one might be a longer term answer, but I don't want to end up with a smooth glossy top surface, so I'm thinking that:
1) laying a chopped strand mat right on top of the resin might work? The problem is that the fibres will run in all random directions, which is the one thing that real thatch doesn't do.
2) I've found this long strand insulation and I'm wondering if it might be possible to comb it out into moree or less parallel strands and lay that on top? ( Yes I know that glass fibres are nasty and I'd need skin and breathing protection). https://www.ebay.co.uk/itm/A-Glass-Long ... 0891458078
I know that there are boat builders etc amongst us, and I wondered if anyone could offer advice on these thoughts or any other suggestions, please?
Philip
Re: Using GRP
Sorry Philip, although far more familiar with GRP than I would prefer, I can't see your idea working I'm afraid,(hoping I'm wrong!) as to preserve it all you would have to wet out the glass' and I would imagine it will just become a very low relief surface albeit with straight striations instead of the criss-crossed ones.
I wonder how the plumbers hemp would go. with a coat of polyester resin brushed gently on it. If you were happy with the look of it previously, I'm sure the resin would last longer than the PVA. Just a thought and maybe not a good one.
Grant.
I wonder how the plumbers hemp would go. with a coat of polyester resin brushed gently on it. If you were happy with the look of it previously, I'm sure the resin would last longer than the PVA. Just a thought and maybe not a good one.
Grant.
Re: Using GRP
Thanks Grant. I did wonder if it might sink in and disappear, so you've more or less confirmed that (and saved me some money!).
I have also considered encapsulating the hemp, as you suggest, but I suspect that to get it weatherproof I'd actually need to coat it thickly enough to end up with the same effect as glass fibre.
I'm currently wondering if artificial grass bent down flat might be effective. The trouble with that idea is that artificial grass is either poly propylene or nylon as far as I can tell, and I'd then have a painting problem. Unless.... I can overcoat it with a thin layer of resin which might soak in enough to grip but remain thin enough to keep the texture.
I have also considered encapsulating the hemp, as you suggest, but I suspect that to get it weatherproof I'd actually need to coat it thickly enough to end up with the same effect as glass fibre.
I'm currently wondering if artificial grass bent down flat might be effective. The trouble with that idea is that artificial grass is either poly propylene or nylon as far as I can tell, and I'd then have a painting problem. Unless.... I can overcoat it with a thin layer of resin which might soak in enough to grip but remain thin enough to keep the texture.
Philip
Re: Using GRP
Pioneering work Philip. The skills, knowledge and ingenuity of members on here never ceases to amaze mephilipy wrote: ↑Mon Oct 29, 2018 12:21 pm Thanks Grant. I did wonder if it might sink in and disappear, so you've more or less confirmed that (and saved me some money!).
I have also considered encapsulating the hemp, as you suggest, but I suspect that to get it weatherproof I'd actually need to coat it thickly enough to end up with the same effect as glass fibre.
I'm currently wondering if artificial grass bent down flat might be effective. The trouble with that idea is that artificial grass is either poly propylene or nylon as far as I can tell, and I'd then have a painting problem. Unless.... I can overcoat it with a thin layer of resin which might soak in enough to grip but remain thin enough to keep the texture.
Ian
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Re: Using GRP
I too would avoid GRP if at all possible. It is great stuff for the right application but I would stick to natural materials like your hemp. What about waterproof spray, as used on shoes/clothing? Maybe some type of clear grease. Real thatch has to be replaced from time to time.
There is a fencing product called brushwood fencing which is sold in rolls as garden screening. I have some in my garden supplied by Primrose Ltd. They may be able to supply small amounts. It would make great thatch and could be bundled, tied and pinned like the real thing I reckon.
There is a fencing product called brushwood fencing which is sold in rolls as garden screening. I have some in my garden supplied by Primrose Ltd. They may be able to supply small amounts. It would make great thatch and could be bundled, tied and pinned like the real thing I reckon.
Re: Using GRP
If you look at my original build thread you'll see how much effort the hemp took. It's lasted 4 years at a pinch, but in reality was looking a bit tatty after 2-ish, so I'm looking for something more permanent than that, even if it doesn't look quite as realistic. https://gardenrails.org/forum/viewtopic ... ed+cottageinvicta280 wrote: ↑Mon Oct 29, 2018 2:46 pm I too would avoid GRP if at all possible. It is great stuff for the right application but I would stick to natural materials like your hemp. What about waterproof spray, as used on shoes/clothing? Maybe some type of clear grease. Real thatch has to be replaced from time to time.
Spray, grease, etc isn't going to do it I think, if liberal quanities of waterproof PVA broke down.
Now that is a thought. I've seen it in garden centres but never paid it much attention before, but I'll take a look. Having said that, I'm still back to the weather proofing problem unless I can soak it in resin or something.invicta280 wrote: ↑Mon Oct 29, 2018 2:46 pm There is a fencing product called brushwood fencing which is sold in rolls as garden screening. I have some in my garden supplied by Primrose Ltd. They may be able to supply small amounts. It would make great thatch and could be bundled, tied and pinned like the real thing I reckon.
Thansk for the idea though.
Philip
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Re: Using GRP
Just Julie, of this Forum, has used bristles from a yard broom, laid in layers and overlapped. The effect is decorative (as are some thatched roofs) and could last quite some time outdoors...... possibly? Unsure of the type of adhesive required for outdoor use, but I'm sure someone can offer suggestions.
Perhaps there are stockists of the bristles in longer lengths?
Perhaps there are stockists of the bristles in longer lengths?
The best things in life are free.... so why am I doing this?
Re: Using GRP
Peter,
Thanks. Julie did post about her roof the last time this subject came up. I'm sure that one of the modern synthetic builders adhesives would do the job. Something like Stixall or one of the Evo products perhaps
Thanks. Julie did post about her roof the last time this subject came up. I'm sure that one of the modern synthetic builders adhesives would do the job. Something like Stixall or one of the Evo products perhaps
Philip
Re: Using GRP
Why not try welcome fibre door mats it has been out on a cottage ,3 years now (not the one with welcome on it)
j moogan
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Re: Using GRP
That sounds like a good idea?
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Re: Using GRP
Some of the brushwood fencing in my garden has been here three years. The fencing itself breaks down over time as the wind and foxes, cats etc cause it to break apart but the fibres seem very weather resistant
Re: Using GRP
Thanks for the suggestion. In fact yesterday afternoon I ordered samples of various bits and pieces to experiment with and coconut matting was one of them, so we'll see how it goes.
Philip
Re: Using GRP
Peter Jones of Compton fame achieved passable results using faux polyester fur (p.171 of 'Making Model Buildings for Garden railways')
He brushed it vigorously to tame it, and then daubed on polyurethane varnish to hold it down, which also gave it some weather resistance.
He brushed it vigorously to tame it, and then daubed on polyurethane varnish to hold it down, which also gave it some weather resistance.
Phil
Sporadic Garden Railer who's inconsistencies know no bounds
My Line - https://gardenrails.org/forum/viewtopic ... 41&t=11077
Sporadic Garden Railer who's inconsistencies know no bounds
My Line - https://gardenrails.org/forum/viewtopic ... 41&t=11077
Re: Using GRP
I read the very same article Phil….Great reading.
He also used coconut matting if I recall.
Have a look Phillip, it may inspire you to something the great man did.
He also used coconut matting if I recall.
Have a look Phillip, it may inspire you to something the great man did.
ROD
Life is so easy when I run my trains.
https://gardenrails.org/forum/viewtopic ... 41&t=11364
https://www.youtube.com/@fairywoodlightrailway
Life is so easy when I run my trains.
https://gardenrails.org/forum/viewtopic ... 41&t=11364
https://www.youtube.com/@fairywoodlightrailway
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