Search this site
Welcome!
I work with the geoarchaeology of old stone: quarries, monuments, rock art. And I try to figure out about their weathering and conservation. My domestic services are managed through FABRICA, a registered Norwegian company established with good partners. On this website I publish articles on heritage. For the joy of old stone! Per Storemyr
Visit FABRICA’s website!
-
Recent posts
- Julekalkbrenning for Fortidsminneforeningen – et bidrag til bygningsvernets økologi
- Rock art and red-coated bedrock in Alta, Arctic Norway
- Steinmysteriet i Stavanger domkirke. Hvor kommer klebersteinen i koret fra?
- Om «Soknakrossen» på øya Sokn i Rogaland. Steinkrossen kom nok fra Hyllestad!
- Hyllestad Millstone Quarry Landscape
Popular right now
Find posts by Google Maps
Follow on:
Follow on Facebook
SOAPSTONE! New book on its archaeology and history!
Book: The Stones of Nidaros Cathedral
Book: QuarryScapes
Get informed! State of the Art on natural stone today:
Tag Archives: lime mortar
Partner in the Borgund Kaupang Project – on the rise and fall of a medieval town
My company is proud partner in the Borgund Kaupang Project (2019-2023), on the rise and fall of a “lost” medieval town. The project is coordinated by the University of Bergen and financed by the Norwegian Research Council. Together with Alf Tore Hommedal, my task is to source building materials such as marble, soapstone and lime for mortar and to interpret the whole building process, from quarries to churches. Thanks a lot to project manager Gitte Hansen, Therese Nesset and a great international team for a fine kick-off meeting in Ålesund last week! Continue reading
Posted in Marble, New projects, Norway, Old quarries
Tagged Borgund Kaupang, Borgundkaupangen, life in the middle ages, lime, lime mortar, marble, Middle Ages, soapstone
Leave a comment
Selja kloster: Hvor kom middelalderens kalkmørtel fra?
Det har en stund vært kjent at hvit og fin marmor ble brent for å lage kalkmørtel til byggingen av Selja kloster i middelalderen. Men hvor ble det brent? Hvor kommer marmoren fra? Her ute i havgapet, langt vest i Norge, er det ingen marmorforekomster. Man må til Sunnmøre eller Bergenstraktene for å finne marmor. Til marmor på Sunnmøre er det ikke langt, bare 20 km i luftlinje. Men i veien står Norges farligste hav, Stadhavet. I middelalderen ble bygningsmaterialer fraktet med båt! Turte man å gå 50-60 km på dette farlige havet, attpåtil med ytterst farlig brentkalk i lasten? Fraktet man heller ubrent kalk? Eller tok man heller den lange turen sørfra, mer enn 250 km? Vi har ennå ikke svaret, men med undersøkelser innen Riksantikvarens bevaringsprogram for ruiner begynner vi å nærme oss. Continue reading
Posted in Archaeology, Marble, New projects, New publications, Norway, Old quarries
Tagged georkeologi, kalkbrenning, kalkovn, lime burning, lime mortar, limekiln, marble, Middle Ages, Selja, Sunnmøre
1 Comment
Novel micro-images of lime mortar destruction by frost weathering
Frost is here again and thus weak building materials are at risk, for example traditional lime mortars applied during the last summer season. Over the last few days I was able to observe frost heaving in a lime mortar that has not properly hardened/carbonised due to recent rainy and moist weather. As far as I know, no one has previously documented such ice crystal growth, on a micro-scale. The phenomenon is akin to frost heaving in a soil profile: The force of growing ice whiskers lifting the uppermost parts of the soil. Continue reading
Taken by the frost! The beauty and destructive force of ice growth on masonry
After 29 years of working with weathering of cultural heritage, I have finally seen it “live”: How the force of ice can destroy plaster on stonework. It is more diverse than I though. A complex and fascinating world of beautiful … Continue reading
Posted in Heritage destruction, Monument conservation, Norway
Tagged frost heaving, frost weathering, Hyllestad, lime mortar, limekiln, Norway, salt weathering, weathering
3 Comments
Frostforvitring på kulturminner: Bilder av et fenomen få har dokumentert og formidlet
Mange har meninger om frostforvitring på kulturminner, på stein, murverk, puss og mørtel. Men det er få som har dokumentert fenomenet med bilder. Derfor er det mye synsing om «isens ødeleggende kraft». Her presenteres nye fotos av hva som faktisk kan skje når kalkmørtel blir offer for frost. Det dreier seg bl.a. om islinser som dannes og vokser i eksisterende svakhetsplan og sprenger biter bort. Stedet er den nye, «middelalderske» kalkovnen i Kvernsteinsparken i Hyllestad i Ytre Sogn. Continue reading
Posted in Monument conservation, Norway, Ruins, Weathering history
Tagged frost weathering, Hyllestad, Kvernsteinsparken, lime mortar, limekiln, weathering
Leave a comment
Burning the beaches. Happy New Year from the Faroe Islands!
The Faroe Islands, in the middle of the North Atlantic Ocean. Basalt and other volcanic stone everywhere! Yet, many buildings on the islands were erected by the use of lime mortar, from the Middle Ages on. There is absolutely no limestone on the Faroes. Thus, lime mortar had to be produced by “burning the beaches” – collecting shells from beach deposits, stacking the shells above a fire in a field kiln – and let it happen: Hold the temperature at some 900 degrees centigrade for a couple of days, and out comes quicklime to be mixed with water and beach sand for the mortar. Continue reading
Posted in Archaeology, New projects, Old quarries
Tagged Faroe islands, lime burning, lime mortar, limekiln
5 Comments
HOTMIX! Nybrent Hyllestadkalk leskes og testes som restaureringsmørtel på Stavanger domkirke
Endelig i gang med hotmix! Med lesking og testing av nybrent Hyllestadkalk til bruk i mørtel for restaurering. Som mange vil huske, brant Norsk Kvernsteinsenter lokal marmor i en nybygd «middelalderovn» i Hyllestad sist juni, et prosjekt støttet av Riksantikvaren. Planen er å leske og teste brentkalken på flere restaureringsprosjekter i Norge, bl.a. på Selja klosterruiner og Stavanger domkirke. Sidene jeg regelmessig jobber sammen med kollegaer i Stavanger, har vi nå gjort flere tester på domkirken med George Murphy og Bjørn Idland, som er restaureringsmurere ved Arkeologisk Museum (UiS). Det er ikke lett å leske kalk som er brent på tradisjonell måte. For det vil alltid være halvbrente og ubrente biter i slik kalk. Akkurat som i middelalderen. Vi lesket kalken på tre ulike måter, og det var liten tvil: tradisjonell hotmix ga det foreløpig beste resultatet! Continue reading
Posted in Monument conservation, New projects, Norway
Tagged experimental archaeology, lime burning, lime mortar, limekiln, marble
1 Comment
“Nidaros: The Portland Cement Cathedral” (Baker Memorial Lecture)
This week I attended the international conference “Rediscovering Traditional Mortars” in Trondheim. The conference was hosted by the Nidaros Cathedral Workshop and it was part of the annual conferences organised by the British Building Limes Forum and its Nordic counterpart.
I was lucky to be invited to keep two lectures, one on the experimental lime burning in Hyllestad earlier this year, and the Baker Memorial Lecture during the gala dinner. A very great honour to keep this traditional lecture for more than 230 delegates! I concentrated the lecture on the use of Portland Cement during the restoration of Nidaros Cathedral from 1869 on. Read on to get a glimpse of all the problems it has caused! Continue reading
Posted in Monument conservation, New publications, Norway
Tagged lime burning, lime mortar, limekiln, Nidaros Cathedral, Portland Cement, Trondheim
2 Comments